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Description: Underwater video of thousands of red crabs swarming in low-oxygen waters on Panama's Hanibal Seamount. Credit: Pineda J, Cho W, Starczak V, Govindarajan AF, Guzman HM, Girdhar Y, Holleman RC, Churchill J, Singh H, Ralston DK. (2016) A crab swarm at an ecological hotspot: patchiness and population density from AUV observations at a coastal, tropical seamount. PeerJ4:e1770nnLearn more at https://vimeo.com/161655689