The unearthing of a newly identified species suggests a different, older lineage of duck-billed dinosaurs lived in southern Patagonia and Antarctica.

National Fossil Day, part of Earth History Week, is sponsored by the U.S. National Park Service and aims to educate and inform the public about fossils' scientific value.

New fossils of the carnivorous Spinosaurus aegyptiacus suggest that the dinosaur spent much of its time in the water.

The new finds from two sites in Russia suggest that all major groups of dinosaurs may have had at least a few feathered species.

A tiny, furry-tailed creature was the earliest ancestor of the placental mammals—a group excluding marsupials and egg-laying mammals—and lived after the extinction of the dinosaurs, according to a study in the 8 February Science.

The origins and early evolution of placental mammals have long been a matter of debate.