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 ...

For decades, scientists have known that platypuses and echidnas – Australia’s unique egg-laying mammals – have another ...

SYDNEY: Australia’s burrowing echidna evolved from an aquatic ancestor in what scientists have described as an "extremely rare" evolutionary transition, according to a new study released Tuesday.

Echidnas are egg-laying, insect-eating mammals native to Australia, according to the Australian Museum. The country has only one species, the short-beaked echidna, which can be found throughout ...