If a cat's head fits somewhere, they can pass their whole body through it!

Have you ever noticed how cats seem to be able to squeeze into any little crevice? Sometimes these feats seem impossible and yet, they still manage to make it.

This is because of their free floating clavicle bones. Unlike humans whose clavicles are definitely set in place.

Their forelimbs are attached to their body by means of this floating clavicle, which means that cats can fit into any space that they can pass their heads through.

Wouldn't it be cool if we could do the same? Cats also have an extra lumbar and thoracic vertebrae, which is why they are so much more flexible than humans.

(Source)