Cats are (almost) liquid

> While dogs slowed down and hesitated before they attempted to use an uncomfortably small opening, in the case of cats, we did not detect this change in their behavior before their attempt to go through even the narrowest openings. However, remarkably, cats showed hesitation both before they attempted to penetrate the shortest openings, and while they moved through it.

I just skimmed, but I didn’t see any mention whiskers. It’s seems to me that cats can make highly precise measurements of width just by sticking their heads in a space, but height judgments requires additional consideration.

If you have ever put a cone on a cat (which lasts about five minutes), you see they get crazy. They hug the walls.

Their whiskers are a major factor in their perception.

I think they can also dislocate their spine.

My cat likes to sit in what we call his "Buddha" position, with his back bent about 90 degrees, and his paws in front. This seems to be a common position. He'll sit like that for an hour.