Paleontologists have revealed the fossilized remains of a curious creature that is not only one of Earth's oldest animals, but may even be the first to have ever been mobile. Dubbed Quaestio ...

We know them in death. We know how they died, some of what they ate, how they grew, where they may have roamed, and even if they suffered from disease or injury. Preserved bones can tell us a lot, but ...

Exquisitely preserved fossils of a shark that thrived during the Cretaceous period appear to solve a long-standing mystery around how it hunted and where it fits into the shark evolutionary tree.