Why are orcas attacking boats and is the behaviour spreading?
Science Weekly
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The Threat of Killer Whale Attacks in Spain and Portugal
In the beginning it was just a few of them and now approximately at least 15 individuals has been seen engaged in this behavior. They are all from the same population, from the same group, they're probably all related to some degree. The typical thing is to see 5, 6, 7 animals together. I haven't experienced it myself but I've spoken to quite a few who have had quite frightening experience. There's been about 500 of those since it started in 220. It's not a small problem, it's actually quite a big problem.
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