Small, scaleless fish with slimy skin that live in shallow ocean waters or tide pools, often found clinging to rocks with their fins.
From Greek 'blennos' (mucus, slime), referring to the fish's characteristically slimy coating. The word entered English in the 18th century as naturalists described these common coastal creatures.
Blennies are masters of disguise and adaptation—some can breathe air and live in tide pools exposed to the sun, while others are so slimy they can slip through tiny crevices that seem impossible to escape from.
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