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Cats are definitely very deadly. Domestic house cats in the US alone are responsible for killing a few billion birds and somewhere around 22 billion mammals each year.

To achieve such astronomical figures, their claws are a vital asset.

In regards to cat claws, there's usually one big misconception. Cats don't sharpen their claws, instead they shed them. That pulling they do whilst "sharpening" their claws on soft furniture, is just trying to encourage their claws to shed.

Their claws also grow directly off of the bone.