They are black above, with a sharply contrasting white oval patch around each eye; the belly is white with white markings projecting up along the animals' sides. They have a high, triangular dorsal fin midway between head and tail, and broad, paddle-shaped flippers. Male killer whales may reach a length of 30 ft (9 m) and females half that length.
Swift and ferocious animals, armed with more than four dozen sharp teeth, killer whales are the only cetacean (see whale ) that feeds regularly on birds or mammals. Killer whales may eat seals, sea birds, and fish, and in packs they may even attack larger whales. The female gives birth to a single calf, up to 7 ft (2.1 m) long, following a gestation period of approximately one year. Females mature in 6 to 7 years, males in 12.
They are classified in the phylum Chordata , subphylum Vertebrata, class Mammalia, order Cetacea, family Delphinidae.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.
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