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...