Found in Australia and New Guinea, the platypus and echidna are called monotremes, and they are unique for being the only mammals that lay eggs. The amphibious platypus has a bill and webbed feet ...

Research from the University of Adelaide shows microbial communities in echidna pseudo-pouches undergo dramatic changes while the animal is lactating, which could help in creating an environment ...

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.

As the world’s only surviving egg-laying mammals, Australasia’s platypus and four echidna species are among the most extraordinary animals on Earth. They are also very different from each other.