Our fairly large house is segmented into many smaller areas by a great number of baby gates. Two of our cats have figured out that, with their cat-like (perhaps in this case, I should call it cat-esque, because they are, after all, actually cats) agility, they can easily leap over the three-foot annoyances. The other two cats have not been able to figure this out. Or, maybe it could be that when a cat has a ten-pound frame, and insists on carrying around twenty pounds with it, that cat's agility is slightly less impressive.
Regardless, they are very angry about it. And angry cats are not exactly quiet.
5 years ago