Fish can recognise themselves in photos by identifying their own FACE, study claims

Despite not having the biggest memories in the animal kingdom, it turns out that fish are more intelligent than previously thought. Researchers at Osaka Metropolitan University in Japan have discovered that the'cleaner' wrasse fish, Labroides dimidiatus, is able to recognise itself in a photo. The species is known to attack unfamiliar fish in its territory, but when presented with an image of its own face on a stranger fish's body, it did not react to it. This suggests that the cleaner wrasse clocked the image as being one of itself through just the facial features, and so does not see it as a threatening stranger. 'This study is the first to demonstrate that fish have an internal sense of self,' said lead author Dr Masanori Kohda.