The platypus and echidna, often regarded as some of the most peculiar animals on Earth, may be hiding a far more complex ...

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 ...

An analysis of a 100-million-year-old fossil has found that the creature it belonged to, similar to a monotreme like the echidna and platypus, was water-dwelling. The study supports the theory ...