An orca carrying a salmon in its mouth in south-east AlaskaMinden Pictures/AlamySome of the orcas off North Americas west coast have taken to wearing dead salmon on their heads, resurrecting a curious trend that was first reported in the 1980s.Local photographers noticed the salmon-wearing orcas last month and so did researchers. Deborah Giles, science and research director for the non-profit organisation Wild Orca, was observing the marine mammals in South Puget Sound in south-west Washington a few weeks ago. We saw one with a fish on its head, she says. So that was fun
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