Common clownfish in a sea anemone, Raja Ampat Islands, Indonesia Apr 7, 2026

Common clownfish in a sea anemone, Raja Ampat Islands, Indonesia

Sea anemones may look like underwater flowers, but they"re actually animals—close relatives of jellyfish and corals. Anchored to rocks or reefs, they use a sticky base and a crown of waving tentacles armed with tiny stingers to capture passing prey. Those stings can paralyse small fish, yet one famous neighbour is immune.

© Magnus Lundgren/Nature Picture Library

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