A new study suggests the platypus and echidna — the only egg-laying mammals — had a water-dwelling ancestor. The finding ...

Welcome ancient survivors! These creatures have remained little altered for millions of years and continue to roam the planet ...

Both animals are monotremes, the only living mammals that lay eggs rather than giving birth to live young. To shed more light on echidna evolution, Hand and her colleagues reexamined a humerus (upper ...

“The typical mammal from the time of dinosaurs probably shared a lot more biology with a monotreme than with a horse, a dog, a cat or ourselves.” Therefore, he said, monotremes provide a ...