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 ...

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 ...

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.

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.

Australia is known for its odd wildlife, but the echidna might just take the crown. With spines like a porcupine, a snout like an anteater, and the ability to lay eggs like a reptile, this bizarre ...

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

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 ...

Platypus bones are relatively compact, helping the duck-billed, beaver-tailed mammal remain under water with minimal effort. By contrast, echidna bones tend to be lighter and more hollow — consistent ...