Despite resembling an echidna bone on the surface, the ancient humerus had thicker walls and a reduced cavity for bone marrow. "We were surprised to find that the internal structure looked more like a ...

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 ...

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

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 ...

New fossil evidence suggests echidnas evolved from a water-dwelling ancestor, not a land-based one. The bone structure ...

Typically, mammals give birth to live young. However, three unusual species defy this norm. Scientists are intrigued by the ...

Some creatures made it from the prehistoric era to today. Discover 5 species that have survived since the age of dinosaurs.

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.