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You must be a cat zoologist.
Do you know about Chinese-li hua?

A cat will tremble or shiver when it is extreme pain.

I know, but this is just a computer-generated image.

A cat sees about 6 times better than a human at night, and needs 1/6 the amount of of light that a human does - it has a layer of extra reflecting cells which absorb light.

Well, we seem to be getting further and further away from the main topic.

Cats have 30 vertebrae (humans have 33 vertebrae during early development; 26 after the sacral and coccygeal regions fuse)

So they're more flexible, right?