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Аquatic mammal of the family Delphinidae, the only modern representative of the kind of killer whales. Killer whales — the largest carnivorous dolphins, different from other dolphins contrast black-and-white color. For orcas typical sexual dimorphism: males reach a length of 9-10 m with a mass up to 7,5 m, females — 7 m with a mass of up to 4 T. In addition, the dorsal fin of males is high (1,5 m) and almost straight and females — about half and bent.