A small, brightly colored marine sea slug or nudibranch, belonging to the family Aeolidae, that feeds on sea anemones.
From 'Aeolus' (possibly alluding to rapid, wind-like movement) + '-id' (member of a family). The family name Aeolidae reflects 19th-century taxonomic naming conventions.
Aeolids are wild—they eat stinging anemones but somehow steal their stinging cells and repurpose them as their own defense weapons, making them biological pirates.
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