A sea mouse is a wormSourced
Hairlike structures on this marine worm show shifting colours
Aphrodita aculeata, called the sea mouse, is a polychaete worm of the North Atlantic and nearby seas. Its hairlike setae have a red sheen and can flash blue and green as the lighting changes. Their fine structure creates this optical effect.
The mouse name belongs to a marine worm, not a mammal.
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Aphrodita aculeata · Wikimedia contributors
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Reviewed: 2026-10-10