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

In the case of domestic cats, dogs and many other domesticated species, intentional and unintentional selection by humans ...

A recent study shows that marine oxygen levels were crucial to the evolution of early Paleozoic trilobite body size, ...

But when the researchers peered inside, they saw something different ... evolved from land animals and share lineage with hippos. But there are few examples that show evolution from water ...