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Triplefin hiding in coral. Triplefin (family Tripterygiidae, upper left) fish sheltering in a hole in large hard coral (family Faviidae). Corals such as this are often called 'brain' corals due to their resemblance to the surface (cortex) of the brain. Photographed off Komodo National Park, Komodo, Indonesia. (KEYSTONE/SCIENCE PHOTO LIBRARY/MATTHEW OLDFIELD)