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There is a saying in journalism "dog bites man" is not news. "Man bites dog" is news, so what about "whale bites great white shark"? That seems to be what has been happening in the waters off South Africa. In the past few days, three great white sharks have washed ashore, killed - apparently - by killer whales. Alison Towner is a marine biologist who has performed autopsies on the sharks. She told James Menendez about her findings. (Picture: Killer whale Credit: Jane Cogan)
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