It is a somewhat contentious finding, but some scientists have claimed that certain reef fishes (Cleaner wrasse) can recognise their own image in a mirror (https://www.theguardian.com/environment/2019/feb/07/scientists-find-some-fish-can-recognise-themselves-in-mirror). Such an ability has been hailed, in other animals, as evidence of self-awareness and relatively advanced neural abilities (unlike the general view that fish only have a mini-memory). It could be the case that mirror recognition means something else in these fish.
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