Twenty disemboweled sharks have washed up on a South African beach putting the spotlight on a pair of shark-hunting killer whales whose behavior has fascinated scientists and wildlife enthusiasts.
Orcas, the ocean's apex predator, usually hunt dolphins in these parts and have been known to prey on smaller shark species. But evidence of attacks on great whites was previously limited."They probably came from somewhere else. West Africa, east Africa, the Southern Ocean, we don't know," said 45-year-old Simon Elwen, who heads Sea Search, a scientific collective.
"Within southern Africa, Port and Starboard have been seen from as far west as Namibia to as far east as Port Elizabeth," said Elwen. The authors of last year's study also said the attacks confirmed sharks have a flight response and could have broader implications. In the Antarctic two orca populations -- not subspecies, but different groups that overlap at the margins -- used very different hunting techniques, taught across generations.
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