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The attacks are the latest in a long series of incidents involving killer whales over the last few years.
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Wild orcas have been documented on multiple occasions making food 'offerings' to humans.
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The unexplained behavior has resulted in more than 700 cases of killer whales attacking and damaging boats.
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Sailors off the Iberian coast have been attempting to find ways to protect their boats from being attacked by killer whales.
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A 14-year-old orca named Wikie has succeeded in imitating some of the words spoken by her trainer.
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A 105-year-old killer whale is still going strong after being sighted off the coast of Washington State.