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

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

Analysis of the fossil suggests that the only two egg-laying mammals, platypuses and land-based echidnas, both descended from ...

“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 ...

Learn more about the difference between bioluminescence and photoluminescence, and about the particular chemical compounds ...

New analysis of a 100-million-year-old fossil embedded in a rocky cove in Australia suggests echidnas may have evolved from ...

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

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

Analysis of single bone may tell us if the platypus is an evolutionary anomaly — starting on land, then returning to water.