via Scientific American

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Giacomo Bernardi of the University of California, Santa Cruz, has captured the first video documenting tool-use in a fish. Bernardi observed the fish–an orange-dotted tuskfish (Choerodon anchorago), which is a type of wrasse–in shallow water off the coast of Palau. The animal dug up a clam from the sandy sea floor with its pectoral fin, carried the prize in its mouth some distance to a rocky area and then cracked it against the rock, using it as an anvil.