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Sea anemone and anemonefish
The stinging tentacles of a sea anemone offer the immune anemonefish shelter and a safe place to lay eggs. In return the anemone gains a “guard dog.” Anemonefish prune harmful parasites from their hosts and drive off fish that prey on anemones, such as some butterflyfish. After a day of feeding on plankton, an anemone gathers itself into a bunch for the night. Anemonefish, protected by a mucus on their skin, snuggle into the stinging mass, protected till daybreak.