Blue triggerfish and cleaner wrasse
Blue triggerfish (Pseudobalistes fuscus) with a bluestreak cleaner wrasse (Labroides dimidiatus). Cleaner fish have a symbiotic (mutually beneficial) relationship with their host fish: the fish remove harmful parasites from the fish's body and in return are allowed to feed unharmed. Photographed in the Red Sea off the coast of Egypt.
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