Orcas sometimes pick up a behavior for a while and then quit it just as quickly.
According to NPR, the spate of odd encounters has spanned from the coasts of Portugal and Spain up to France. No one has been injured or killed, but the orcas have damaged several boats, and reportedly sank a sailboat on July 31.
Scientists aren't sure why the orcas are going after rudders, but the incident near France was farther north than previous encounters, which have occurred near Spain and Portugal. This suggests that more than one pod of orcas have picked up the behavior, Renaud de Stephanis, president and coordinator at CIRCE Conservación Information and Research, a cetacean research group based in Spain, told NPR.
Meanwhile, orcas in the Pacific have recently taken to playing with crab pots, Jared Towers, the director of Bay Cetology, a research organization in British Columbia, told NPR. Nevertheless, scientists aren't sure what is attracting the European orcas to rudders. It might be that they like the feeling of water being moved by a boat propeller, de Stephanis suggested to NPR.
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