The oldest leech ever discovered has turned out to be a shape shifter of expectations, preserving a body plan that looks ...

A near complete skull fossil found in Antarctica has revealed the oldest known modern bird — a mallard duck-size creature related to the waterfowl that live by lakes and oceans today, a new study has ...

Scientists have unearthed in Mongolia the oldest and most complete fossil of a pachycephalosaur, a group of dinosaurs known for their dome-shaped skulls, according to a new study published Wednesday ...

A new study reports what might be the oldest fossil animals ever found. And we're also learning more about what role the hippocampus plays in certain types of visual memory. Hosted by: Hank Green ...

Therapsids, the ancient relatives of mammals, once roamed Earth in great numbers during the middle to late Permian period. These land-dwelling creatures would later evolve into mammals, but their ...

A newly discovered "hell ant" fossil may be the oldest ant ever found, scientists say. This fossilized insect was unearthed in what is now northeastern Brazil and lived around 113 million years ago, ...

A fragment of a face from a human ancestor is the oldest in Western Europe, according to the results of a new study published this week. The incomplete skull — a section of the left cheek bone and ...

A “remarkably well-preserved” fossil discovered in Brazil, dating back 113 million years, is now the oldest ant to have ever been found by scientists, a new study has revealed. The ancient fossil was ...

A 430-million-year-old fossil reveals that the first leeches were ocean predators, not bloodsuckers. The discovery radically shifts the timeline of leech evolution by more than 200 million years.