The major threats to amphibian species include pandemic disease and changes in climate and in land use. A study of the global distributions of these threats predicts that they will affect most ...

One of the greatest transitions in evolutionary history was the emergence of tetrapods, or four-legged vertebrates, onto land. By about 340 million years ago, fins had become fingers and limbs, ...

Today's tour of the aeons before the appearance of the human species on Earth begins with a rare and most important piece of evolutionary evidence provided by the fossils of a creature called ...