Meet Sox the cat. Sox just did. As in, Sox just met herself. Then she stood up on her back legs, and waved her paws around. It's unclear if Sox is
a) checking out a rival
b) posing and dancing, which is the main point of mirrors
c) becoming self-aware
d) all of the above
Seeing as cats can entertain themselves to no end by chasing their tales, it would surprise no one if Sox simply thought she saw another feline, but...this is not how cats generally act when they see each other. Sox seems to have figured something out about how her movements correspond to the cat in the mirror's movements.
So maybe she realizes it's her, and is having that first moment of "is that really what I look like?" Most cats probably think that they are tigers. Sox does look sort of freaked out by this whole thing. Her tail is puffed up and flipping around, which is a sure sign of cat agitation.
But if that's true, than maybe this is a moment that Sox becomes more aware of herself as one being in this strange world. As much as we humans think of this as an all or none thing, there are probably gradients that we can observe across different humans and across one person over a lifetime. Experiments have been done in which a dot is placed on the forehead of a chimp, and then the chimp is shown a mirror. Chimps will touch their own forehead, but most primates will touch the forehead of the monkey in the mirror.
So, which one would Sox touch? And would it be the swat of a rival, or a touch of recognition. What goes on in that little mind of yours, Sox the cat?