Amazing knowledge

Chapter 8 Cute Animals: You Don't Understand Their Minds
* How long can a cockroach live without a head?

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Cockroaches have always had the reputation of "Xiaoqiang who can't be beaten to death". No matter whether you chase after it or use various "biochemical weapons", even if you send Xiaoqiang to the guillotine, it can still survive firmly in the world .So here comes the question, how many days can a headless cockroach jump around?

Generally speaking, a week is absolutely fine.If there are no predators and the wound is not infected by bacteria or viruses, then it is no problem to let the headless cockroach live for ten days and a half months, or even a month.If human beings lose their heads, they will see Hades in minutes, but cockroaches are quite capable, and they are still alive and kicking without their heads.

In fact, this is mainly because cockroaches and humans have completely different nervous and blood circulation systems.

Cockroaches rely on the air valves in their bodies to breathe. There are air valves on every part of the cockroach’s body, and it can still breathe without its head.And the whole blood circulation system of cockroach is also open, and it does not need relatively high blood pressure.

Unlike humans, blood pressure must be high enough for arteries to support blood circulation to every part of the body and provide sufficient oxygen and nutrients to all parts of the body.For humans, if the blood pressure is too low, the major organs of the body will be ischemic and hypoxic, and acute hypotension may even cause shock. This is one of the fundamental reasons why humans will die immediately without their heads.

And even if the cockroach is headless, the wound will solidify quickly, because the sudden change in blood pressure has no effect on it, or it does not have the so-called "blood pressure" at all, and it will definitely not suffer from blood flow due to sudden changes in blood pressure like humans. As noted.

Also, cockroaches are cold-blooded, which means they need much less food than humans.It can last for several weeks on a single meal, and it can live longer if it is full just before being beheaded.

Therefore, the vitality of cockroaches is so powerful. After all, the history of cockroaches can be traced back to hundreds of millions of years ago, and human beings are only a few million years old. We can only admire the vitality of cockroaches!
Bottom line: Variations in body structure allow cockroaches to live for days without a head, a tenacious species with a history longer than humans, and eradicating them will be no easy feat.

*Why do flies keep rubbing their feet?
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I don’t know whether the annoying flies are born with cleanliness or nervousness. In short, every time a fly stops and lands on a certain place, it will either rub its feet nervously, or raise its feet nervously to rub it.How much does a fly dislike its feet, why can't it rest?
In fact, it is not because of the "love to clean" that flies often lift up their feet and rub them. Flies are dirty and annoying. They really have nothing to do with cleanliness. The reason why they keep rubbing their feet It's because the feet are so dirty that if you don't rub off some dirt, you won't even be able to fly.

There is no nook and cranny that flies do not visit. There are many places where they move, stopping here, standing there, and the flies' feet will automatically secrete mucus. In this way, all kinds of dirty things It's stuck to the foot.If you don't rub your feet in time, the chances of them being shot to death by humans will be greatly increased, because they are almost crushed to death by these dirty things, so how can they fly!
Also, the taste organs of flies grow on their feet.Therefore, if a fly wants to "taste", it must touch it with its feet.But every time the food is tasted, the food will still remain on the feet, so the flies will rub their feet after tasting the taste, so as not to taint the taste with the next taste.

Even if the "original taste" of the food is not considered, if the flies do not clean up the food residue on their feet in time, they will lose their sense of taste and even lose the ability to fly after a long time.

It turns out that flies rub their feet to fly higher and eat better!But in order for us to eat better, let’s stay away from the flies. Do you dare to try the delicacies it has tasted?
The final word: Flies are out-and-out pests. They can carry a variety of germs on their bodies and infect them to humans. Once you see them, if you can't get rid of them, you should try to drive them away, otherwise the food may be eaten by them. Pollution aside, we may also get diseases from them.

*Why does the female praying mantis eat the male praying mantis?
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The female praying mantis will always gnaw off the head of the male praying mantis after the passion, and then slowly eat the male mantis bit by bit.Although it is said that the most poisonous woman's heart, but this female praying mantis is too poisonous!Now, let us walk into the inner world of the female praying mantis to find out.

Some love is to love each other, but some love is to love and kill each other. Praying Mantis actually practiced such a blood-weeping love.

In fact, the female praying mantis doesn't know what she is doing at all, because in her head, there are only two kinds of things in front of her: "can eat" and "can't eat". They don't know that this is the male praying mantis who just mated with them.

The eggs in the female praying mantis need a lot of nutrients when they develop. That is to say, the female praying mantis not only needs to feed herself, but also feeds the next generation in her stomach. However, it is already a luxury to feed herself, and it is even more difficult to feed the next generation. , and the male praying mantis in front of him is food at his fingertips. When a hungry person faces a big meal, do you think he will say "no"?

Furthermore, the nerve center of the male mantis is in the lower body, and they are veritable "lower body thinking animals".The mating season of praying mantises is in autumn. Autumn is the season of "famine" for praying mantises. At this time, if you go to mate with female praying mantises, the risk of being eaten is very high.

Moreover, even if the mantis's head is eaten, they will not stop mating, and their desire to mate will even become stronger. This is the real "lower body thinking".

The final word: It is not common for female praying mantises to eat male praying mantises. Only when food is extremely scarce, female praying mantises will hunt male praying mantises. Male mantises are not so-called "husbands" in their eyes, but just passing food.

*Why do chickens stretch their heads while walking?
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Apart from humans, birds seem to be the only ones that walk on two legs, but chicks stretch their heads every time they walk, showing their cuteness at a glance. Why can they walk with such enchanting steps? ?

Birds are the rare creatures other than humans that can walk on two legs. Although they only have two legs, everyone can walk out of their own style. The small and exquisite birds walk very lightly, jumping and jumping.There are also common chickens and ducks that belong to birds. When ducks walk, their small tails are always wagging; while chickens walk, their tails are peaceful, but their heads can't rest, and they always point one by one. ordered.

In fact, the reason why different animals can take completely different steps is directly related to the structure of the body.The reason why people can walk freely is that in addition to our two long legs, we also have flexible arms. When people walk, their hands will always swing involuntarily. In fact, this is our body’s self-adjusting center of gravity. , to ensure that we can walk smoothly.

But chicks have no hands. Although they have a pair of fluffy wings, these wings are basically decorations. It is okay to flutter occasionally. If they are allowed to fly like birds, it will be really difficult for chicks.However, the predecessors of Xiaoji found that as long as the two feet walk in a straight line, the center of gravity will remain balanced and fall firmly in the middle.

But here comes the question again, how can these small chicken feet support the "huge" body?Although the center of gravity is stable on the middle line, it still has to sway back and forth.

There is no way, the tail that is right for display is hopeless, so the little chicken had to move the idea to the head.The center of gravity ran backwards, and the chick stretched his head forward, pulling the center of gravity forward.If the center of gravity slips to the front, the chicken will shrink its head and push the center of gravity back. Isn't this controlling the center of gravity?Perfect!
It is precisely because of the disobedient center of gravity that the chick's cute steps are created.

The final word: The reason why chickens stretch and shrink their heads when walking is because they need to rely on the offset of their heads to adjust the center of gravity of their bodies to ensure stable walking. In fact, they swing their arms when walking It's a truth.

*Why do so few birds feed on leaves?
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As the saying goes, "the early bird gets the worm". The birds are so pitiful that they have to get up early to eat.If birds eat leaves, then they don’t have to get up early, they can eat at any time!But why don't birds like to eat leaves?
It seems that birds only like to eat meat and not vegetarians. In fact, they can’t be blamed for being picky. If the leaves can be eaten, why do they have to work so hard to catch small bugs to feed their hunger?It is really that the delicious leaves of the leaves cannot be enjoyed by birds.

Eating leaves seems simple, green leaves are everywhere, and you can fill your stomach just by looking for them.But it's not that simple for the bird.There are still stones all over the road, why haven't I seen anyone eating stones!In fact, if birds don’t eat leaves, it’s the same as humans don’t eat rocks—they can’t eat them.

Most birds are small and delicate. Even large birds such as goshawks cannot hide the "delicacy" of their bodies.

The mouths of birds are not called beaks, but beaks, because they have no teeth in their mouths.Letting these toothless "mouths" handle the leaves is simply too difficult. Even if the birds break the leaves into small pieces and eat them into their mouths, they don't have the ability to chew the leaves. What kind of leaves do they eat? , It's still like in the stomach, it can't be digested at all.

Another point is that birds are petite, and their digestive tracts are also extremely short. Foods rich in cellulose like leaves, birds can only look at, not enjoy.

The stones that we humans don't eat, birds do occasionally eat a few, but they eat very small stones.They eat stones not because they have special functions to digest these hard things, but because their digestive system is too weak, and they have to rely on these small stones that can be directly excreted from the body to help them "crush" the food in their stomachs , to help digestion.

The final word: Birds are not picky eaters and refuse to eat leaves, but no matter how good the leaves are, they can't enjoy them.However, the Creator did not leave the leaves for the birds as food, but gave them wings so that they could search for traces of bugs in a wider world.

* Are ostriches cowards?
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I don't know when it started, ostrich has become synonymous with timid and timid.Once they encounter something, they bury their heads deep in the sand, trying to avoid all dangers behind them.Why are they so timid?

Ostriches are cowards for a long time, but that doesn't mean ostriches really are.

When an ostrich encounters an "enemy", the first thing it thinks of is not to run away with its legs, but to bury its head in the sand, trying to deceive the enemy.In fact, this should be a trick of the ostrich. The speed of the ostrich is very fast, and the fastest speed can reach 96 kilometers per hour. This speed can not even catch up with ordinary "player-level" racehorses!

The wings of ostriches can also fly originally, but because of the constraints of the living environment, they gradually lost this ability and turned to "develop" their feet, because running is the only rule of survival on the grassland.When faced with danger, ostriches are fully capable of running to protect themselves. The reason why they choose to stay in place and bury their heads in the sand is actually to protect their unborn babies.

Ostriches are oviparous animals. Among all birds, ostrich eggs are the largest, so in the eyes of many wild animals, ostrich eggs are a big meal.And ostriches are rare dedicated parents in nature. It takes about 40 days for an ostrich egg to hatch. During these 40 days, ostriches will take turns guarding the ostrich egg.

If danger comes at this time, it is absolutely impossible for the ostriches to abandon their children and run for their lives. The only thing they can do is to lower their heads, spread their wings and hide all the ostrich eggs under their wings, and then flatten themselves on the desert. , use their own protective color to confuse the enemy, because the feathers of ostriches are very similar to the color of sand. They are so camouflaged that they look like a dead branch from a distance, and they can often deceive predators and let ostrich eggs escape. .

Even the "disguise strategy" can be used freely, it's time to tear off the label "cowardly and stupid" from the ostrich!

Bottom line: Ostriches are not cowards, but rather great parents, willing to put themselves in danger to protect their unborn child.

*Is the fish's memory really only 7 seconds?

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It is said that fish are the least boring creatures in the world, because their memory is only 7 seconds, and after 7 seconds, the whole world is brand new to them.is it really like this?

In fact, fish would be bored because their memories really last longer than 7 seconds.Fish are the oldest members of the vertebrate family.As early as 5 million years ago, fish-like animals appeared. After such a long period of evolution, fish have already become a large family. Fish can be seen in almost all aquatic environments on the earth. Roughly estimated, the earth There are already more than 2 kinds of fish on the Internet, and the number is increasing at a rate of more than 100 kinds every year.

The "background" of fish is so great, of course there are not a few people who study them.There are also various studies on the memory of fish, but so far no study has shown that the memory of fish is only 7 seconds.

For example, among the ornamental fishes, Paradise fish not only has a super-high appearance, but also has a better memory than fish. They are naturally curious babies. If Paradise fish sees a new stranger in its own territory, it will definitely gather Let the "newcomer" criticize, and when Paradise Fish takes a closer look at the newcomer, it will abandon the "newcomer" without hesitation.

If Paradise Fish and the "newcomer" meet again after a while, Paradise Fish will not be interested in the "newcomer", because it will soon find that it has already picked up the other party's property, and there is nothing new about it.

Experiments have shown that the memory of paradise fish is at least 3 months.More experiments have shown that the memory of fish is likely to be long-term.Therefore, "the memory of fish is only 7 seconds" is completely a beautiful mistake, and fish will be bored, but it is much better than having an empty head and no memory!

The final word: At present, there is no definite research result to prove that the memory of fish is only 7 seconds. On the contrary, many studies have found that the memory of fish is the best among animals.

*Why is red cloth used in bullfighting?
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The biggest event in Spain is bullfighting. The bullfighter always holds a piece of red cloth during the bullfight. Why must he choose red?
Many people think that the reason why the red cloth is picked is that when the cow sees red, it will be angry and will take the initiative to attack.In fact, the bull is red and green blind, its world is black and white, and it can't distinguish red at all. The reason why matadors choose red cloth is actually the audience.

Red has always symbolized enthusiasm and passion. After people see red, their emotions will be mobilized, and they will become more excited and happy. That's why matadors love red so much.

The reason why the bull is so attached to the red cloth in the hands of the matador is because the cloth in the hands of the matador keeps shaking.Cows are color blind, they cannot distinguish colors.But bulls are very interested in shaking objects, so matadors keep shaking the cloth in their hands during bullfights.

Moreover, the cows are always kept in small and dark pens before they go out on the field, and their emotions are already very depressed.After they came out, the matador kept shaking the cloth in his hand, so the bull became very angry and persistently "pursued" the cloth in the matador's hand.Matadors usually wear a bright red cape. In fact, this is also a "bullfight", because when the matador runs, the cape flutters in the wind, which will make the bull more angry and chase after it desperately.

In fact, for the bulls, it is better to use a piece of red cloth than to replace it with a white cloth, because in this way they can see more clearly and the effect of bullfighting will be better.

Bottom line: It doesn't matter if it's red or any other color to the cow, because colorblindness can't tell the difference.The reason why the bulls in the bullring are so angry is that they become excited and angry because of the constant shaking in front of their eyes.The choice of red is actually to mobilize the atmosphere of the audience.

*Are army ants a deadly killer?

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It is said that the real deadly killer in nature is actually the army ants. There are tens of thousands of army ants moving in swarms. Wherever they go, they seem to have been swept away. Even forest overlords such as tigers and leopards are not their opponents.

Army ants are indeed swarms, which is not wrong, but their lethality is not as terrifying as the legends say.Army ants are actually a group of ants that do not have a fixed nest, and they all forage collectively.

When the army ants appear, they will be in a mighty battle. They will not send out "reconnaissance teams" to explore the way like ordinary ants before they act. As long as the army ants take action, it is a large-scale collective action.

The army ants are the most powerful army ants in the world, and their "collective" has at least 200 million members, and the large ones can even reach 2000 million.Once the Wei's army ants are dispatched, at least they have to stretch a battle line of several hundred meters.

Although the size of the army ants is large, they do not have the legendary lethality, because the speed of the army ants is slow.

The army ants have an overwhelming victory in number, but their fastest marching speed is only 20 meters per hour. It takes an hour for a normal person to walk a few steps.At their speed, wanting to eat people is a bit ridiculous, unless the person can't move, lying obediently and being wrecked by the army ants, otherwise as long as he can move, he can easily get rid of the army ants.

And those large animals killed by army ants are either immobile, or they can only move in a small area with no way to escape, such as captive pigs, trapped prey and so on.

The main food of army ants is insects. For slow-moving insects, army ants are indeed a terrifying "big killer".

The final word: Army ants are not as scary as the legends say. Although they always move in groups and look powerful, army ants move too slowly. Humans or other animals with a slightly faster walking speed There is no need to worry about being "killed" by army ants.

*Why can earthworms become several knots?
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After a rainy day, earthworms come and go, but there is something magical about earthworms. After cutting them into several pieces, they will not die, but will turn into several new earthworms. Why is this?

This ability of earthworms is almost comparable to Sun Dasheng’s miraculous ability of pulling roots and hairs and blowing monkeys, but the reason why earthworms can do this is not because they have the ability of Monkey King, but because their level is too low!

Earthworms are low-level annelids, but they have the basic head, tail, mouth, stomach, and anus.But the body structure of an earthworm is very simple. The earthworms we see are all one by one. In fact, the body of an earthworm is "two". The body of an earthworm is like two straws of different thicknesses set together. The two ends of the earthworm's "straw" are the same size, but the two ends of the earthworm's "straw" are pointed.

In the middle of these two "straws" is the body cavity fluid of the earthworm, and the body wall of the earthworm is outside.The body wall is connected one by one, just like what our eyes see.The body wall has the muscle system of the earthworm, and it is the muscle system of the body wall that the earthworm can crawl on the ground.

When an earthworm is cut into several sections, the muscles on the section will contract immediately, and the white blood cells used for blood coagulation will gather in the section, causing the section to quickly form a plug and then close.And part of the muscle on the section will self-dissolve, and then combine with the original cells of the earthworm to form a regenerative bud.

In these newly generated regenerative buds, the tissue cells of the earthworm's original organs will continue to "replenish" the missing parts through mitosis, that is to say, the section without a head will grow a new head, and the section without a tail will grow a new one. A tail will also be added until the broken earthworm grows back into a complete earthworm.

Although an earthworm can live if it is broken into several segments, if it is broken too much and the remaining part of the body is too short, the tissue cells in the body cannot complete this "recovery" process, that is to say, the short segment of the earthworm His life has come to an end.

The final word: The structural characteristics of ring-shaped animals determine that earthworms can grow back into their bodies and survive even if they are broken into several segments.

*Can dogs eat chocolate?
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Dogs have always been human’s best friend. Some owners love their dogs and share anything delicious with them. But is smooth and delicious chocolate a treat for dogs with a sweet tooth?

Anyone who owns a dog should know that chocolate is a delicious snack for us, but it is deadly poison for dogs.The United States once conducted a cause of death investigation on pet dogs who died of poisoning, and finally screened out the five most common "poisons", and chocolate was on the list.

The reason why chocolate can "poison" dogs is that the culprit is actually theobromine contained in chocolate. The scientific name of theobromine is actually "3-dimethylxanthine". The biggest function of 7-dimethylxanthine is to stimulate the nerve center, increase the heart rate, and relax the muscles. Just like the advertisement said, it feels like "being in love".

Methylxanthines have no effect on us, because human metabolism is fast, even if we ingest methylxanthines, they can be decomposed by the liver and excreted through body fluids.

But dogs do not have such an efficient metabolic function. To put it simply, for small dogs like Teddy and Pekingese that we often see, as long as they eat more than 50 grams of dark chocolate in a short period of time, they will immediately lose weight to the world. Say goodbye because the "feelings in love" come on too hard and the heart beats too fast for the dog to take it.

The content of theobromine in dark chocolate is the highest in chocolate, but the content of theobromine in white chocolate is less, so little to almost none, so dogs can eat white chocolate with an open stomach, but let’s forget about dark chocolate.

The final word: your honey, that's arsenic.Chocolate that is delicious to us becomes a deadly poison in front of dogs. People who love dogs should never feed them chocolate, especially black chocolate with high cocoa content.

* Will the ants be thrown to death?
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If a person jumps from several floors, even if he is lucky enough to save his life, he will be seriously injured, but will an ant fall to his death if he falls from a high altitude?

In fact, this question involves the concept of terminal velocity in physics.No matter what kind of object it is, as long as it moves in the air, it will be affected by both gravity and resistance.If you fall from a high altitude, gravity "pulls" us to accelerate towards the ground, and resistance will prevent us from moving towards the ground.

As long as it is still on the earth, the magnitude of gravity is only linked to its mass. The greater the mass, the greater the gravity it receives.But the size of the resistance is affected by many factors, among which the surface area of ​​the object occupies a relatively large proportion.The larger the surface area in contact with the air, the closer the resistance and gravity are, but no matter how large the resistance is, it can only be as large as gravity at most, and it will never exceed gravity.

When the mass is constant, the smaller the surface area of ​​the object, the more likely the gravity and resistance are close to equal, that is to say, the two can cancel each other out, but since the object itself has an initial velocity when it falls from a high altitude, the object will maintain a constant The "terminal velocity" of falling to the ground.

If the objects are small, like ants, their terminal velocity is very low.That is to say, no matter how high the altitude is, the ants will only slowly fall to the ground at a very low "terminal speed" in the end, and there is no possibility of falling to death.

However, if the ant is placed in a vacuum, with no air resistance and gravity to contend with, the ant will descend faster and faster.In this way, as long as the height is sufficient, the possibility of the ant falling to death is very high.

The final word: Ants will not be killed even if they fall from a high altitude, because they are small in size and light in weight, so the terminal velocity is very low, which is not enough to cause any damage to their bodies.

*Why is the poisonous snake not poisoned to death?

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As long as one is bitten by a poisonous snake, if the serum is not injected in time, it is very likely to die.The venom of poisonous snakes is so powerful, but why don't they themselves be poisoned to death?
We all know that poisoning occurs only after being bitten by a poisonous snake. This is because the venom of a poisonous snake is actually stored in the poison sac at the root of the tooth.Usually, these deadly poisons will not flow out of the poison sac, and the poisonous snake will only open the poison sac when it captures the prey, allowing the venom inside to spray into the blood of the prey.

Snake venom is generally divided into two types: one acts on the nerves; the other acts on the blood.But no matter what kind of snake venom it is, the main components are enzymes, polypeptides and proteins. If these things want to work, they must go through the circulatory system and the lymphatic system.

If they go to the wrong place and go to the digestive tract, they are just a group of protein aggregates, and they no longer have the characteristics of "poison", because as long as there is no wound such as an ulcer in the stomach, the snake venom can only be used by the digestive system obediently. Decompose, digest and absorb like ordinary protein.Therefore, no matter whether it is a human being or a poisonous snake itself, if it "eats" the snake venom by mistake, it will not be poisoned to death.

Rather than being poisoned to death by a poisonous snake, it is better to say that he was bitten to death by a poisonous snake.Because the venom can only work if it enters the blood.But if a poisonous snake bites itself or is bitten by another poisonous snake, they may die, because the blood of poisonous snakes generally does not have snake venom antibodies, so they will also be "bitten to death".

The final word: the venom of poisonous snakes can only be fatal when it enters the blood. If the venom enters the digestive tract, it will not kill people. However, poisonous snakes generally only keep the venom in the body and will not let it enter the blood.

*Are there male and female snails?

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Generally speaking, most animals are dioecious. When mating, the female and the male must cooperate with each other to reproduce offspring, but these "routines" do not work when it comes to snails. I heard that snails are hermaphroditic?

Yes, snails are indeed hermaphrodites, having both female and male genitalia in their bodies.Although snails have a "complete" set of genitalia, they cannot self-fertilize and still need partners to help each other.

The mating method of snails is considered strange in the whole nature. When they mate, they first touch each other with their antennae, and then their bodies are close together, and their reproductive cavities are tightly joined.

After the snail waited like this for a few minutes, the genitals began to switch, and it was Koiya's turn, which was the snail's penis.The two snails each insert their love arrows into each other's genital openings, and then use intense friction to stimulate the penis to ejaculate in the other's female genitalia.

The mating of ordinary animals is one-way, but snails are two-way, and their mating process is more like a cooperation of exchanging sperm.The snail shoots its own sperm into the other's vagina, and then receives the other's sperm in its own vagina, and the sperm it receives combines with its own eggs to reproduce.

The mating time of snails is very long, usually two to three hours.Not to mention the long mating time, they lay eggs for a longer time, which lasts for an hour or two each time, which is a torment for such a small snail. collapsed and died.

The final word: snails are indeed hermaphrodites, but they don't self-fertilize.In addition, eels and earthworms are also hermaphrodites, and some humans may become hermaphrodites due to chromosomal mutations.

*Where is the heart of the shrimp?
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Whether it is river prawns, lobsters or prawns, they are all nutritious aquatic products. Not only are they high in protein, but they are also low in cholesterol. But have you ever thought about a question, which part of the shrimp is the heart?

Many people have eaten shrimp, but not many people have noticed this problem. In fact, if you look closely at the prawns, you can see the beating heart in their bodies, because the whole body of prawns is transparent, even the blood is There is no color, so we can directly see the structure of the shrimp body through the shrimp shell.

The heart of the shrimp is actually in the middle of the whole shrimp body. The "shrimp tail" that we usually eat is actually the belly of the shrimp. The meat of the belly of the shrimp has a very high nutritional value and can help us improve our body's immunity .

"Shrimp head" should actually be called "cephalothorax". The heart of the shrimp is hidden here. On the back of the cephalothorax, there is an angular body in the part "bordering" the abdomen. This light brown thing is the shrimp's heart.There are 7 main arteries around the heart of the shrimp. These 7 arteries lead to the antennae, liver, and large arteries leading to the front, back and bottom.

There is not only the heart in the head and chest of the shrimp, but also the stomach pouch. There are often some food residues in the stomach pouch, so it is better not to eat this part.

The final word: The heart of the shrimp is actually located in the middle of the body, where the head, chest and abdomen meet.

*Can humans hatch chickens?
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The newborn chicks are all fluffy, with bean-sized eyeballs dripping, and they are very cute. Some children even want to hatch a chick with their own eggs.Is this okay?

Although the matter of hatching chicks seems quite simple, as long as the hen guards the eggs every day and warms them with her own body temperature, the chicks will break out of their shells and be born chirping.But if we human beings really want to hatch a chick and do it like a hen, no matter how long you keep the egg on your body, the chick will not break its shell.

The most indispensable condition for chicks to successfully break their shells is temperature. The temperature that can ensure the successful birth of chicks is between 38°C and 45°C, and this constant temperature must be guaranteed for 21 consecutive days.

Although humans are warm-blooded animals, our normal body temperature is 37°C, and it is impossible to hatch chicks at such a temperature.If the body temperature of human beings is kept above 39°C for 21 days, human body functions will be unbearable.So without outside help, the temperature of the human body is not enough to hatch the chicks.

Furthermore, not all eggs can hatch chicks, and only fertilized eggs have the prerequisites for hatching chicks, but the eggs we usually come into contact with are only hen eggs, not the eggs that can grow Fertilized eggs of chicks.

The final word: human body temperature alone cannot hatch chicks. If you want a chick to be born smoothly, you must first have a fertilized egg, and then you must have an incubation period of up to 21 days. During the incubation period, you must ensure A suitable incubation temperature, only when these two conditions are met, can a person hatch chicks.

*Why do cicadas use urine as a weapon?
Practicality: ★★★★
Knowledge: ★★★

Interesting: ★★★★
Children in the country like to catch cicadas in summer, and sometimes they see that they are about to be caught, but it spouts a stream of urine, which catches people off guard.Cicadas are what we call cicadas, why do they use urine as a weapon?
Cicadas release a lot of urine when escaping. In fact, they don't want to use this urine to attack humans. This is just people's thoughts.

The reason why cicadas do this is actually to reduce the weight of their bodies and expel excess fluid from their bodies so that they can escape more quickly.

Cicadas live in the soil when they are young, and their food at that time is the roots of plants.When they grow up a little, the cicadas will start to dig holes, climb to the trunk to survive, and survive by sucking the juice of the plants.

Cicadas have a hard mouthpart, which can help them easily break through the bark and penetrate deep into the trunk to suck the sap of plants.These juices are rich in nutrients, which can completely "eat and drink" the cicadas.

In forestry, cicadas are veritable pests. When they lay eggs, they first destroy the bark and then hide their eggs inside. Sophora japonica, poplar and various fruit trees are the targets of cicadas.

Although cicadas will attack humans by spraying urine, this is not their "weapon", but their way of self-protection.

The final word: Cicadas don't want to use urine as a weapon, but when facing danger, urine becomes a burden for cicadas. They have to excrete the urine in order to escape as soon as possible.

* Is Nangying Yingxue real?

Practicality: ★★★★
Knowledge: ★★★

Interesting: ★★★

The story of Nangying Yingxue has appeared in our textbooks since we were young, admonishing us to study hard and cherish the current environment, but have these stories that we have memorized by heart since childhood really happened?
Nangying Yingxue is actually two stories. "Nangying" tells the story of a poor boy named Che Yin in the Jin Dynasty. He really wanted to use his evening time to read more books.But Che Yin's family was too poor to afford lamp oil.So Che Yin went to the field to catch a bag of fireflies. Every night, he lit the books with the light of fireflies and studied in the dark.

The protagonist of the story "Ying Xue" is Sun Kang of the Jin Dynasty. Sun Kang also came from a poor background. On winter nights, he reads in the snow under the light of the snow.

First of all, let's judge the authenticity of the story of "Nangying".Earlier researchers studied the light emitted by fireflies.Studies have found that at least 100 fireflies are needed to illuminate the words on a book with the light emitted by fireflies.In the Jin Dynasty, it was not impossible to catch 100 fireflies, but it was somewhat difficult to read with the light of fireflies.

Because the light of fireflies flickers, and there is no rule at all.Reading under such an unstable light source, the pupils adjust the focus all the time in order to adapt the eyes to the current brightness. As long as it takes a while, the eyes will be very tired, which will lead to symptoms such as headaches.

Therefore, the story of "Bag Firefly" can indeed be realized, but it is difficult to persist, our eyes will instinctively reject the light of fireflies.

The story of "Yingxue" is similar to that of "Nangying". It is possible to realize it, but it is difficult to sustain.

The final word: Nangying Yingxue's story is designed to resonate with us and remind us to study hard.Most people only care about the spiritual significance of the story, but don't go deep into the authenticity of the story itself.

* Are mandarin ducks really affectionate?

Practicality: ★★★

Knowledge: ★★
Interesting: ★★★★
"Only envy mandarin ducks but not immortals" has implied the love of love, white head, and love as deep as the sea since ancient times. As a representative of loyalty, mandarin ducks have always appeared in literature and film and television dramas. However, mandarin ducks are really like what everyone imagines. So dedicated?
In fact, mandarin ducks are not only unsympathetic, but also very caring!

Mandarin ducks themselves are migratory birds. Take the mandarin ducks in the Changbai Mountain area as an example. Every spring, summer and autumn, mandarin ducks live in places with trees and rivers. They start to lay eggs and hatch young mandarin ducks in June.When winter is coming, the mandarin ducks will fly together to the warm south for the winter.

The mandarin ducks we usually see seem to be one female and one male, and they are intimately dependent on each other, so we regard mandarin ducks as a representative of "a couple for a lifetime".

But, in fact, mandarin ducks, especially male mandarin ducks, are very sentimental.

If male mandarin ducks are strong, they may have several female partners at the same time, but if they are thin, they may not even have a single partner.

But when it comes to the breeding season, mandarin ducks will wholeheartedly stay by the side of a partner, inseparable.

The devotion of male mandarin ducks can only be maintained until the hatching of young mandarin ducks.At this time, the male mandarin duck neither takes care of the unborn child nor cares about the life of the partner, and wholeheartedly acts as a "hands-off shopkeeper".

At this time, even if the partner dies, the male mandarin ducks will not "keep the festival", they will look for the next partner.Even if the female mandarin ducks are safe and sound, when the breeding season is over, the male mandarin ducks will abandon their former love and look for new mates.

The final word: mandarin ducks are not devoted, they will be faithful only during the breeding season, but once the breeding season is over, they will immediately abandon their wives.The most affectionate animal in nature is the swan. If the partner dies, the swan will be depressed all day long and "keep the festival" for life.

*Why can cattle and sheep grow meat without eating meat?
Practicality: ★★★★
Knowledge: ★★★

Interesting: ★★★

There is a saying in China: "What you eat, what you make up for." Although there is some truth in this saying, it will not work if you put it on cattle and sheep. What cattle and sheep eat is grass, but what they "make up" is Real meat, what's going on here?
Although cattle and sheep eat grass, the cellulose content in the grass is very high.Cellulose is like an immovable iron bucket to many animals.Because cellulose is very difficult to digest, many animals can't chew it, and even if they can chew it, it won't change anything in the stomach.The intestines and stomachs of many animals are not capable of digesting cellulose, so what they eat will leave intact with their excrement.

But cattle and sheep are not the same, cellulose can not trouble them, all herbivores have a catalyst called cellulase.However, some animals themselves cannot synthesize cellulase, but there are a large number of microorganisms parasitic in their digestive tracts, and these microorganisms can replace animals to secrete cellulase.

Cellulase is simply the nemesis of cellulose. When encountering them, cellulose can only be decomposed obediently and turned into sugar and starch to provide nutrients for animals and maintain the life activities of herbivores.

Meat is actually composed of protein, and the substances that make up protein are amino acids. Although the protein content in grass is not high, there are amino acids, even if there are no amino acids, there are transaminogenic effects!After a series of chemical reactions, herbivores can provide enough protein to the body even if they eat grass, so that they can be transformed into meat!
The final word: Although cattle and sheep eat grass, the grass is also rich in nutrients. Coupled with the internal chemical reactions and metabolism of animals and plants, they can eventually be turned into meat.

*When will fish be drowned?
Practicality: ★★★

Knowledge: ★★★★
Interesting: ★★★★
Human beings are so small in front of the vast sea, no matter how good the water quality is, they may be swallowed by the sea in an instant, but fish have lived in the sea for so long, why are they not drowned?

The reason why people are drowned is because people cannot breathe in the water, so it is more accurate to say that they are suffocated to death.

Humans breathe through the lungs, and our lungs are distributed with countless capillaries. These capillaries help us achieve gas exchange, so that we can always obtain sufficient oxygen to maintain life activities.

However, the structure of fish is different from that of humans. Fish rely on gills to breathe.There are two gills on the outermost gills, one on the left and one on the right.These two gills are the main organs of fish breathing.The gills are covered with gill silk, and there are gill flakes on these gill flakes, and the gill flakes are all capillaries.The walls of capillaries are very thin, and gases can easily pass through this barrier into the blood, which then provides oxygen to the organs throughout the body.

Some oxygen is dissolved in the water. When the fish swims in the water, the water convects in the small gills. The capillaries on the gills continuously absorb the oxygen dissolved in the water, and the carbon dioxide produced by the fish is sent to the water through the capillaries. As soon as it comes and goes, the fish completes a breath.

Although fish can breathe in water, it does not mean that fish will not be drowned.Even though fish spend their entire lives in water, they can drown, which can only happen if the gills are not working.

Fish are temperature-changing animals, and their body temperature will be adjusted appropriately with the water temperature. However, if the water temperature changes too drastically, the fish will not have time to adapt, and the functions of the body will be disordered in a large area, and it will cause death in serious cases. It's like "drowning", but they are actually suffocated because the gills don't work and oxygen can't enter the body.

The final word: The reason why fish can survive in water is because they breathe with gills. Once there is a problem with the gills, the fish may also be drowned.

*Is it true that after being bitten by a poisonous snake, you can survive by sucking out the poisonous blood?
Practicality: ★★★★★

Knowledge: ★★★★
Interesting: ★★★

After being bitten by a poisonous snake, you immediately put your mouth together to suck out the poisonous blood. The frequency of the plot in TV dramas is too high. Are there many people who are affected by this and think that doing so can prevent the spread of the venom? Save your life?

If you really think so, you are wrong!Sometimes, TV dramas are really harmful. If you really put your mouth on the wound to suck poisonous blood, maybe the one who died first was not the one bitten by the poisonous snake, but the one who sucked the poisonous blood!
Among the various first-aid methods for dealing with snake venom, sucking by mouth is a bad strategy with a very high risk factor but very little effect. The "U.S. Army Survival Manual" published in 2002 pointed out that sucking the wound with the mouth is the last resort, and it can only be implemented when there is no ulcer in the mouth.

Generally, those bitten by snakes are the limbs. Compared with the limbs, the distance from the mouth to the heart is obviously closer. If the venom is sucked with the mouth, the venom is likely to enter the body through the mucous membrane in the mouth.

If there are ulcers in the mouth, the risk factor will soar.After the venom enters from the mouth, it enters the heart through the blood circulation, and then is transported to the whole body, even the brain under the action of the heart. This speed is incomparable to pure limb injuries.

Moreover, if the venom of the wound is sucked with the mouth, the probability of "indirect poisoning" of the mouth is relatively high, and the possibility of the venom being sucked out is very small.

The final word: After being bitten by a poisonous snake, the most direct and effective way is to seek medical help and inject snake venom.The injured should avoid strenuous exercise, so as not to accelerate blood circulation and promote the venom to spread faster.

*Flounder eyes shift, is it true?

Practicality: ★★★

Knowledge: ★★★

Interesting: ★★★★
Animals seem to pay attention to a symmetrical beauty, with two ears on one side, one eye on the left and one on the right, and the nose and mouth are both in the center of the face, but there is also a "unsocial" flounder, whose eyes are on one side , I heard it's because the eyes of flounder move!

Generally, where the eyes of animals are born, they will always grow there, and they will not move their nests, but flounder is different, their eyes can really move.

When the flounder just hatched, the eyes are also very normal, one left and one right, and they grow on both sides of the top of the head, which is very symmetrical.

However, as it grows, the flounder's eyes start to move.At first, the cartilage on the top of the flatfish's head gradually "retreats" to make way for the eyes.After the cartilage on the top of the head is absorbed by the body, the eyes begin to move little by little to the left side of the body.

With the movement of the eyes, the interior of the flounder's body is also quietly changing. When the two eyes of the flounder come together, the flounder cannot continue to float on the water.So the flounder moved their home to the bottom of the sea and started a new life here.

Flounder not only has a peculiar shape, but also has a high value. It is considered an upstart in seafood. The liver of flounder is also the main raw material for cod liver oil.

The final word: the body of flounder is very flat, their eyes are slanted to one side, and the color of the body is also different. The side where the eyes are located is similar to the surrounding environment, which is the best protective color for flounder, while the other side without eyes is white.

*Is it true that you have to turn and run when you are chased by a mad dog?

Practicality: ★★★★★

Knowledge: ★★★★
Interesting: ★★★★
A mad dog doesn't understand human nature, and it's scary when it's mad, and the consequences of being bitten by it are even more terrifying, but I heard that when you are chased by a mad dog, you just need to turn and run, because mad dogs can't turn, this method can really save people. Mouth of a Mad Dog?
If you are really chased by a mad dog, this method will definitely not work.If mad dogs can't turn corners, then they will directly bump into a wall and seek their own death when they encounter a wall. People are afraid of being chased by them!Just run against the wall with them.

Mad dogs usually chase people only after they are infected with rabies, but there is no such thing as "losing the ability to turn" among the symptoms of rabies.

The symptoms of rabies mainly include mental abnormalities and abnormal behaviors, but there is no abnormal nerves.

A dog with rabies may not listen to the owner's orders, will instinctively avoid the sun, and will suddenly eat stones, clods, etc., and some of them will become violent, drooling uncontrollably, and aggressive.

But these are more mental abnormalities, like people with bipolar disorder, they have mental problems, but their intelligence is not affected.

Rabid dogs will also turn corners. If you are chased by a sick dog, it is better to "lead the mad dog into the ditch" than turn the corner and escape.Because the biggest manifestation of rabies is fear of water, rabies even has another name called hydrophobia.

The final word: If you are being chased by a mad dog, it is useless to turn the corner. It is best to seek help from the people around you to drive the dog away.If you are accidentally bitten by a mad dog, you must be vaccinated against rabies, because the probability of being infected with rabies after being bitten is very high.

*The big white piece in the belly of the fish is the sperm of the fish, is it true?
Practicality: ★★★★★

Knowledge: ★★★★
Interesting: ★★★★
When eating fish, we all know that the small yellow particle aggregates are roe, but did you know that the white piece in the belly of the fish is the sperm of the fish?

The caviar we usually eat is actually fish eggs. The protein content of fish eggs is very high, rich in nutrients such as ovalbumin, lecithin, globulin, etc., but the fat content of fish eggs is very small.Fish eggs are an excellent tonic for both the bone marrow and the brain.

Many people mistakenly think that the large white piece in the belly of the fish is fish oil. In fact, everyone thinks wrong. It is the testis of the fish, also called fish white, and some places also call it fish belly white.

Fish sperm are produced here and then stored here.Fish sperm are also very valuable compared to fish eggs.The most special feature of fish sperm is the protamine contained in it. This protein itself is very simple, but at the same time it is very special, because the effect of protamine on hemostasis is very miraculous.

This kind of protamine is widely used in medicine, especially in the face of massive bleeding, the medicine made of protamine is the best hemostatic agent.

Not only that, fish sperm also contains a certain amount of arginine, arginine can directly affect the speed of human metabolism, and timely supplementation of arginine can relieve symptoms such as fatigue and memory impairment.

The final word: the white thing in the belly of the fish is indeed the sperm of the fish. The fish is not only delicious, but also has high nutritional value, especially the roe.

*Dogs have bones in their dicks, is it true?
Practicality: ★★★

Knowledge: ★★★★
Interesting: ★★★★
Every time a dog mates, their buttocks face their buttocks, and their heads face the opposite direction. It is said that the reason why dogs mate in such a strange position is because the dog’s penis has bones. This is true. of it?
Generally speaking, the penises of animals are boneless, but dogs are indeed different from other animals. They have a penis bone, so dogs will adopt "chic" mating positions.

Because of the presence of the penis bone, the penis can be inserted directly into the vagina when the dog mates, and they save the erection.The penises of ordinary animals are usually weak, and only have a certain "hardness" when they are erect, which can help them enter the vagina of female animals smoothly.But male dogs have a penis bone, so they have their own "hardness" and don't need to rely on an erection to complete this step.

After the male dog’s penis enters the female dog’s vagina, the spongy body at the front of the penis bone can be congested and swelled due to the stimulation from the vagina, and the entire penis can become a full circle.The female dog's vagina is then firmly held by the male dog's penis so that the penis does not have to come out of the vagina.How tight can a penis and vagina get stuck?So tight that most people can't separate male dogs from female dogs.

When the penis is stuck in the vagina, the male dog will get off the female dog, and then mate with the female dog back to back, butt to butt.

The general ejaculation time of male dogs ranges from 10 to 45 minutes. Only after their ejaculation ends, the spongy body will gradually shrink back to its original state, and then the bodies of male dogs and bitches can be separated.

The final word: Dogs do have a baculum, a unique genital structure that allows them to enter a bitch's vagina without getting an erection.Dogs are not the only animals with penis bones. Elephants and donkeys also have penis bones.

* What if I poke a hornet's nest?
Practicality: ★★★★★

Knowledge: ★★
Interesting: ★★★

When it comes to wasps, it is estimated that many people will avoid them. After all, this thing is not soft at all when it stings people. One sting is a big bag!If you poke a hornet's nest and provoke a large wave of hornets, what should you do?

Hornets are cute in some respects. They can "suppress" many pests, and the bee venom in their bodies also has certain medical value.In addition, wasps also serve as matchmakers, pollinating plants.In this way, the wasp is not a pest.

But if the wasps sense danger, they will attack. At this time, the wasps are proper "pests"!

Wasps not only have a long stinger, but also have bee venom hidden in their bodies.If you are "kissed" by a wasp, you may have an allergic reaction, swelling of the affected area, or even a poisoning reaction, and some people may even die as a result.

Think about it, if you poke a hornet's nest and be chased by a group of "ferocious" hornets, it would be a very scary thing.At this time, if you run desperately, it will be even more terrifying!
Because of this, the wasps will become more "angry", and they will come out of the nest and "chase" you with all their strength. If you stab a hornet's nest, the most sensible choice is to get down on the spot, cover your head and neck with your clothes, and try to Avoid exposing the skin directly to the outside to give the wasp a chance to "lay the needle".In this way, even if you are stung by a wasp, the toxicity of the bee venom can be greatly reduced, and the wasp will not be irritated.

The final word: After poking a hornet's nest, you must not run wildly. The wise choice is to get down immediately and cover your exposed skin with clothing.

*Is it true that cats can go blind if they eat too much dog food?

Practicality: ★★★★★

Knowledge: ★★★★
Interesting: ★★★

Cats and dogs are the two giants in the pet world. Careful owners will buy special food for their pets. Dogs eat dog food, and cats eat cat food. This should not be eaten indiscriminately. I heard that eating the wrong food will cause serious trouble , especially cats, may go blind if they eat dog food, can they really not mix it?

It's not that they can't mix them. Dogs can eat cat food with their bellies open, provided they like it.But cats really can't enjoy dog ​​food to their heart's content. Although they can occupy dogs' nests unscrupulously, this dog food is really not something they can eat whenever they want.

The reason for this is mainly because of a substance called taurine. Dogs are not short of this substance. Their own bodies can completely synthesize taurine, so this kind of substance is generally not deliberately added to dog food. .

And taurine is essential for cats, this substance can help cats see things clearly at night.But because cats cannot synthesize this substance by themselves, taurine is very lacking in them.

If it is a cat living in the wild, they can supplement taurine by hunting mice, because mice contain a certain amount of taurine.

But if they are pet cats, they can only get the necessary taurine from cat food. If they eat dog food, there is no way to supplement taurine.

If the cat lacks taurine, the vision will be blurred in mild cases, blind in severe cases, and even heart disease will be caused.If a pregnant female cat lacks taurine, she may not even be able to keep the baby cat in her stomach.

The final word: Although cats and dogs are friends of human beings, they are different species after all, and their body structures are also different. If you let cats eat dog food for a long time, it may really cause serious damage to the cat’s body. harm.

*Bezoar is the gallstones of cows, is it true?
Practicality: ★★★★
Knowledge: ★★★★
Interesting: ★★
Everyone should be familiar with Niuhuang Jiedu Pills. You often need it when you have a cold and get angry. We all know that Niuhuang is a traditional Chinese medicine, but do you know that the "real body" of Niuhuang is the gallstones of cows?

We should have heard or seen gallstones. It is a gallbladder disease. The secretions in the gallbladder combine with calcium ions to form small stones, which eventually endanger the health of the patient. From this point of view, This gallstone is really not a good thing.

But everyone should be familiar with bezoar. The best choice for clearing away heat and detoxification is bezoar. Niuhuang Jiedu pills are especially needed when you have a sore throat. Why is bezoar the gallstone of cattle?
If a person has gallstones, it is indeed harmful to health, but if a cow has gallstones, it is somewhat beneficial to human health.

Cattle itself is a herbivore. Cattle gallstones are calcium stones, but they contain a lot of bilirubin, which is a metabolite of hemoglobin and heme.According to traditional Chinese medicine, the smell of bezoar is fragrant, and there is some bitterness at first taste, but a little sweetness can be tasted later.

The medicinal value of bezoar is so great, but it is impossible for cattle to always get gallstones. Natural bezoar is rare in the market, and the price of natural bezoar is even higher than gold.The bezoar in the medicines we usually take are actually synthetic.

The final word: Calculus bezoar is indeed the gallstones of cattle. The stones in the liver are called liver huang, and the gallstones formed in the gallbladder are called guanhuang. Both liver huang and guanhuang are very valuable traditional Chinese medicines.

*Why are there a bunch of mice all their lives?
Practicality: ★★★★
Knowledge: ★★★★
Interesting: ★★
Mice have always been a very troublesome animal. They gnaw on furniture and disturb people. Not to mention, every time they give birth, a bunch of small mice will be born, which is far faster than the speed of people's rodent control.Why are mice so able to give birth?

As the saying goes: "One male and one female, two hundred and five a year." The super reproductive ability of mice is obvious to all. Someone even did an experiment, putting a pair of mice in the laboratory and providing them with sufficient water and food In the end, more than 1000 mice were bred, and this number has a tendency to continue to grow.

However, mice in real life do not have such a strong reproductive ability, because they will control their own reproduction speed according to the surrounding living environment and food reserves.

Even so, rats are staggeringly prolific.Under normal circumstances, a mother mouse can give birth to 5 to 10 pups at a time without external environmental interference.If the physical and environmental conditions of the mother mouse allow, at most 20 pups can be born at one time.

Humans have to be pregnant for ten months to give birth, but the gestation period of mice is only a short 21 days.Moreover, the mother mouse can immediately re-enter the "battle" after giving birth to the mouse and continue to give birth to the pup.

The growth rate of the newly born young mice is also very amazing. In just one month, these mice will become "adults", which means that they can also join the breeding army and give birth to young mice "efficiently".

The reproductive level of mice can be called exponential, and their vitality is very tenacious, and the survival rate of young mice is also high. Unless they encounter natural enemies, mice can go through their whole life "peacefully" and die.

The final word: a mother mouse can give birth to nearly 10 pups at a time. The exponential reproductive ability and super vitality are the main reasons for the groups of mice.

* Is it true that ducks have spiral penis?

Practicality: ★★★

Knowledge: ★★★★
Interesting: ★★★

People have always regarded male genitals as the "lifeblood". Many animals do rely on genitals to reproduce successfully. Different species have different genitals, but the most peculiar one is ducks, because it is said that ducks The genitals are spiral shaped.

Generally speaking, birds do not develop genitals specifically for sperm transmission, at least the vast majority of birds do not, but ducks are clearly a maverick, because they not only have genitals, but also their genitals It is indeed a magical spiral.

The genitals of ducks are not only strange in shape, but also very long, and the length of some male ducks' genitals can even exceed half of the body after erection.

The reason why male ducks grow such peculiar genitals starts with the way ducks mate.

Every year when the mating season comes, the ducks do not breed in harmony, but fight to the death.

Sometimes, the female duck is not willing to mate. If it is a mild-tempered duck of the genus Pochard, that is, the harbor duck, they may respect the opinion of the female duck and not mate.

But this is completely invisible in the brown hard-tailed ducks. In order to reproduce, the brown hard-tailed ducks often overlord the king and forcefully mate with them regardless of the feelings of the female ducks.

The spiral genitals of the male duck play the role of "helping the tiger" at this time, because such complicated genitals enter the body of the female duck, and it is difficult for the female duck to escape.

But the female duck did not submit. In order to resist the male duck's domineering, the female duck's vagina has also become a spiral shape in the continuous evolution. The male duck's genitals rotate counterclockwise, but the female duck's vagina is It rotates in a clockwise direction. In order not to be coerced by the male duck, there is a fluid sac in the vagina of the female duck, which can effectively prevent the male duck from "hardly bowing".

The final word: The physiological structure of ducks is indeed peculiar. In order to adapt to the challenges of the environment, ducks continue to evolve, and even gradually change the shape of their genitals during the evolution process, in order to better survive in nature.

*Jellyfish's body is 98% water, is it true?
Practicality: ★★★

Knowledge: ★★★★
Interesting: ★★★★
The ocean world has always been known for its mystery. There are all kinds of amazing animals and plants in the ocean. Take the common jellyfish as an example. I heard that 98% of their bodies are water. Is this true?
It is mentioned in "A Dream of Red Mansions": "Women are all made of water." From a scientific point of view, the water in an adult woman's body accounts for 75% of the total body weight. At first glance, the proportion is quite large, but if compared with jellyfish Let’s face it, this percentage cannot be mentioned on the table, because the water in jellyfish really accounts for as much as 98%.

Apart from water, the body of jellyfish is protein and fat. Because the water content is too large, the jellyfish we see are all transparent and almost blend with the surrounding water environment.

The body structure of jellyfish is very simple, the outermost layer is the epidermis, the middle is the rubber layer, and the innermost layer is the stomach cortex.The gastric cortex forms an open body cavity, which is the jellyfish's digestive system.There are many gastric filaments distributed in the body cavity. Cnidocytes are densely distributed on these tentacle-shaped gastric filaments. After the cnidocytes anesthetize the food eaten by the jellyfish, the gastric cavity will release a large amount of digestive juice to digest the food and provide the jellyfish with Nutrition.

The gonads of jellyfish are also attached to the stomach cavity, they have no heart, no blood flow around the body, they do not need gills and fins like fish, and they don't even have bones.The tools of jellyfish predation are their tentacles, but their predation method is very passive. Only when the prey actively swims to them, the tentacles of jellyfish can catch these prey.

Some jellyfish can also glow in the water, because a protein called aiquimin will emit blue light once it encounters calcium ions.Some jellyfish contain this protein in their bodies, so they can emit a faint luminescence in the dark deep sea area to attract surrounding food.

The final word: The proportion of water in jellyfish is indeed as high as 98%, making it the animal with the highest water content in the world.

(End of this chapter)