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Killer whales are the largest extant members of the dolphin family. Males typically range from long and weigh in excess of . Females are smaller, generally ranging from and weighing about . Calves at birth weigh about and are about long. The skeleton of the killer whale is of the typical delphinid structure, but more robust. Its integument, unlike that of most other dolphin species, is characterized by a well-developed dermal layer with a dense network of fascicles of collagen fibres.