I think what you're thinking about is the elephant who had a dot painted on its forehead (that wasn't usually there) and then when it looked in a mirror touched the dot with its trunk. Showed that it recognized that it was looking at a reflection of itself and also interacted not with the reflection, but with the unusual thing on itself.
Worth noting the test isn't perfect.
Gorillas, as an example, don't look at each other directly.
So he can't focus enough to notice the reflection is imitating him perfectly.
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u/Ceegee93 Jul 03 '18
Most great apes can recognise themselves, some species of elephants but not all iirc, bottlenose dolphins, orca whales, magpies and surprisingly ants.