"Sperm whales (Physeter macrocephalus), which are the largest of the toothed whales, echolocate to pinpoint their prey. Basically, they wmit clicking sounds that bounce off potential meals, including large squid and other fish. Scientists think an organ inside the animal's massive head (which can take up 25 to 35 percent of its body length) plays a role in transmitting the clicks." Jeanna Bryner
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