“The small, tropical fish known as a cleaner wrasse has just joined the ranks of various mammals and birds that have passed a classic test for determining self-awareness.”

“Many animals we consider social and intelligent, such as dogs, cats, and octopuses, all fail the mirror test. Humans around the world also often struggle with it, with some cultures not passing until six years of age or older.”

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Tiny Fish Just Passed a Classic Self-Awareness Test With a Mirror.

https://www.sciencealert.com/cleaner-wrasse-passes-mirror-self-recognition-test-self-awareness