GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Unicornfish and cleaner wrasse. Blacktongue unicornfish (Naso hexacanthus) being cleaned by a bluestreak cleaner wrasse (Labroides dimidiatus) on a reef. Naso hexacanthus is found in coral reefs in the Pacific and Indian Oceans, and is capable of dramatic colour changes. Photographed in the Maldives.
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