Two Male Cichlids Sparring (IMAGE)

Stanford University

Two Male Cichlids Sparring

Caption

Two male cichlids spar with each other by showing what big mouths they have. When two fish fight, all their movements are at least slightly out of sync. But when the foe is a fish’s mirror image, the "opponent’s" actions are perfectly in time, which seems to trigger an element of fear.

Credit

Todd Anderson/Stanford University

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