Small Fish, Huge Mind: The Marine Fish That Shocked Scientists With Signs of Self-Awareness For a long time, the mirror test was treated like one of the most exclusive clubs in animal science. If an animal could recognize itself in a mirror, researchers often took that as a major sign of self-awareness. Great apes made the list. So did elephants, dolphins, and magpies in some experiments. Fish were never supposed to belong in that conversation. Then along came the cleaner wrasse, a small reef fish that has spent the last few years making scientists question everything they thought they knew about intelligence. The cleaner wrasse first caused a sensation in 2018, when researchers reported that it appeared to pass the mirror test. The result was explosive, but also controversial. Many scientists were skeptical because fish brains are very different from mammal brains, and because the mirror test itself has always been debated. Critics argued that unusual behavior around mirrors does no...
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