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Back in the spring, he was accused of deceiving viewers when he claimed, in his Netflix show Our Planet, that walruses were falling off Siberian clifftops as a result of climate change. This was shown to be untrue by Canadian biologist and mammal expert Dr Susan Crockford, who described the abundant scientific literature, dating back many decades, showing that walruses have always taken to the land, and even fallen from clifftops. She also pointed out that the footage Attenborough used to make his case seemed to have come from a well-documented incident when walruses had been driven over cliffs by...

ANCHORAGE, Alaska - In what some scientists see as another alarming consequence of global warming, thousands of Pacific walruses above the Arctic Circle were killed in stampedes earlier this year after the disappearance of sea ice caused them to crowd onto the shoreline in extraordinary numbers. The deaths took place during the late summer and fall on the Russian side of the Bering Strait, which separates Alaska from Russia. "It was a pretty sobering year — tough on walruses," said Joel Garlach-Miller, a walrus expert for the U.S. Fish and Wildlife Service. Unlike seals, walruses cannot swim indefinitely. The giant,...