Sperm whale , Physeter catodon , also called cachalot , the largest of the toothed whales , easily recognized by its enormous square head and narrow lower jaw. The sperm whale is dark blue-gray or brownish, with white patches on the belly. It is thickset and has small paddlelike flippers and a series of rounded humps on its back. Males attain a maximum length of about 19 metres 62 feet and females about 12 metres 39 feet.
The head is enormous, occupying about one-third of the body length Bonner, It contains special organs that contribute the finest quality sperm oil. The sperm whale is a toothed whale having pairs of conical teeth on the lower jaw Bonner,
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