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

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

Neither animal has teeth, and though they both produce milk, they secrete it through ... probably shared a lot more biology with a monotreme than with a horse, a dog, a cat or ourselves.” ...