In a domestic situation, where cats are largely safe from potential threats, their continued hesitation seems to indicate they are aware of their own body size—or, at the very least, their height.

Well now we start to see them draw up and in toward the cat's body. The tail draws in too and, of course, it's twitching, only now the tip of the tail might be moving up and down or from side to side.

Similarly, size varies between breeds. For instance, the Singapura is the smallest cat breed, with males weighing up to 8 pounds and females weighing just 5 pounds, according to the Cat Fanciers ...