A ‘Self-Aware’ Fish Raises Doubts About a Cognitive Test | Quanta Magazine
https://www.quantamagazine.org/a-self-aware-fish-raises-doubts-about-a-cognitive-test-20181212/
Very few animals have ever passed the mirror test for self-recognition — even most primates fail it. The news that a fish seemed to recognize itself in one recent study has made psychologists and animal behaviorists wonder anew what (if anything) the mirror test proves.