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Summary
Scientists are rethinking the role and effect of killer whales in marine communities, including the possible threat they pose to some of their endangered cetacean cousins. Researchers are now recording killer whale attacks on several species of great whales, as well as seals, narwhals, sea lions, walruses, and even penguins. From Russia's Chukotka Peninsula to South Africa's coastal waters to the icy seas of Antarctica—even in Canada's Hudson's Bay, where they had rarely been seen before—scientists are finding mammal-eating killer whales on the prowl.
