Australia's burrowing echidna evolved from a water-dwelling ancestor in an "extremely rare" biological event, scientists said Tuesday in a new study of the peculiar egg-laying mammals. With ...

according to the Australian Museum. The country has only one species, the short-beaked echidna, which can be found throughout the mainland. “For decades, no one had seen an echidna on ...

A controversial idea suggests the ancestors of echidnas were more like the platypus. For the first time, fossil evidence ...