> For cats it's better to fall off a higher floor than a lower one because they have more time to turn feet down and increase their air drag thus getting under the terminal velocity and allow them to survive the fall.

True, and there's been at least one, probably many, actual study done that came to that conclusion.

Small nitpick (I'm sorry, I couldn't stop myself!), their action doesn't get them "under the terminal velocity," it lowers what their terminal velocity is. It's just the speed at which the wind resistance is enough to prevent further acceleration by gravity. It's terminal as in the end of something (acceleration), not terminal as in the predicted death of the something.

Thanks for the nitpicking, English isn't my native tongue.

For an adult, a fatal fall is possible from the standing position, it's just most of the time people are able to break the fall in some way when they do fall and not land on their head.

So true. Especially: don't push drunkards.

Also because getting their feet facing down allows them to use their legs as shock absorbers. Watch a cat as it lands on a flat surface from a 1 meter high jump, you will see it in action.

Also because cat legs are very good shock absorbers. The hind legs are impressively springy, which is why cats can leap four or five feet into the air without a run-up.

Human legs aren't as flexible. Beyond bent-knee heights, the choice is between learning how to tuck and roll - which takes practice for most people - or having dislocated hips on landing.