I think most mammals and many birds+reptiles probably could recognize themselves in a mirror given proper conditions. Nearly perfect mirrors, especially vertical ones, aren’t typically found in nature. It’s not surprising that when an animal encounters one, the first reaction is most likely going to be fight or flight. I mean imagine if you were walking down a sidewalk, and all of a sudden, a moving hologram of yourself appeared 3 feet in front of you. Your first thought isn’t going to be “Oh look, a hologram of me!” It’s going to be something like “Oh shit! There’s someone else right in front of me!” Even in social species like ours, seeing another of your kind isn’t necessarily a good thing. Males that fight for breeding rights especially are less likely to calmly approach an unknown animal that looks to them like a rival of about equal strength. The video also made some good points about how differences in vision also impacts what the reflection would look like to different animals. I don’t think that would prevent self-recognition, but it definitely may make it more difficult.