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Cleaner wrasse show self awareness in stunning mirror experiments
General • February 23, 2026
Cleaner wrasse have
revealed a
remarkable new side of fish
intelligence.
Marked with fake parasites, they used mirrors to inspect and remove the spots—far faster than seen in earlier tests. Even more striking, some fish dropped shrimp in front of the mirror to watch how its reflection moved, a form of exploratory “contingency testing.” The findings suggest self-awareness may extend well beyond mammals.
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