Fears that one of the world’s rarest creatures had been driven to extinction have been allayed by a tribesman who told conservationists he had recently eaten one. Attenborough’s long-beaked echidna, a little-known, primitive mammal that lays eggs, lives in Papua New Guinea. Only one specimen, found in 1961, has ever been seen by scientists. But fresh evidence that proves the echidna, which was named in honour of the naturalist Sir David Attenborough, is still alive has been found during an expedition by zoologists. Seven people told the scientists that they had seen the spiny creature, which is a relative...