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.