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# Long description

An animation of a dolphin on the right that shows its skull and head facing left where there is a small yellow fish also facing left. A green curved line, which represents the clicking sound wave, emanates from the region of the blow hole above the dolphin’s skull and the sound wave increases in size as it moves towards the fish and then splits in two as it passes over the fish. A red curved line, which represents the returning echo wave, returns from the fish towards the dolphin, increasing in size as it moves towards the dolphin and enters the bottom of its skull. This sequence keeps repeating.