My cats know things in a mirror are really behind them, and they watch the other things, not themselves, so they must know which ones is themself. Just because they don't try to get something off their head that they can only see by looking in the mirror doesn't prove they don't know that it is themself. They don't have sense to be curious or care about what they look like, their brains just don't work like that. If I try to sneak up on one, they see me in the mirror and turn around and look at the real me--that kind of stuff they're interested in. Maybe they are using other senses too, but I know they can see me in the mirror.

There seems to be something grammatically wrong with that paragraph, but you know what I mean.

I know other animals like the elephants and chimps look in their own mouths and try to get paint off of their forehead, but that is just because they are smart enough to be curious about that.

I guess I think the mirror thing is kind of stupid. It's obvious how intelligent (or not) and how much emotion domestic animals have if you live with them. If somebody who can't figure it out, it probably says more about them than the animals.