This Mockingbird has spent days fighting his reflection in our car mirror, thinking that it is another bird. Besides humans, which other animals can recognize their own reflection in a mirror?
There are several species, besides humans, that recognize their reflection as an image of themselves, instead of thinking it is another creature. The mirror test does not involve teaching them the trick. Instead, they have to figure it out on their own. The current list includes chimpanzees, gorillas, dolphins, elephants, pigs, magpies, crows, and pigeons. That does not necessarily mean that these are the most intelligent animals, but it is of great interest in learning more about how brains work.