RICHARD BROOKS / SCIENCE PHOTO LIBRARY RICHARD BROOKS / SCIENCE PHOTO LIBRARY
Grey reef shark (Carcharhinus amblyrhynchos) and bigeye trevally (Caranx sexfasciatus). The shark is saving energy by swimming in loops as it rides on an upwelling current beside a coral reef. The bigeye trevally are swimming alongside the shark and rubbing themselves against the shark's skin, probably in an attempt to dislodge parasites. Footage filmed in Palau in the western Pacific Ocean.
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