GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Parrotfish and remora on a reef. Male greenthroat, or Singapore, parrotfish (Scarus prasiognathos) grazing on an algae-covered coral boulder, with a remora or, sharksucker, (Echeneis naucrates) attached to its underside. Photographed in the Andaman Sea, Thailand.
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