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A solitary killer whale, or orca, has been filmed hunting and killing a great white shark in an "astonishing" attack.
The scientists then reported that the animals, nicknamed Port and Starboard because their dorsal fins are bent in opposite directions, "exhibited a predilection for extracting and consuming the sharks' livers".
During the attacks, the sharks would tightly circle the killer whales, in a desperate attempt to avoid predation," recalled Dr Towner.
Scientists described how the orca gripped the left pectoral fin of a 2.5m long juvenile shark and "thrust forward several times before eventually eviscerating it".
"It's interesting that it's just one animal," he told BBC News, and how much skill it demonstrates in tackling the shark - ramming it in the side and grabbing the pectoral fin to keep away from those big, nasty jaws.
The scientists do not know what is driving the behaviour, but Dr Towner told BBC News that it was becoming evident that "human activities, like climate change and industrial fishing, are exerting significant pressures on our oceans".
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