This illustration shows the primitive arthropod Titanokorys gainesi from the front. This creature lived along the ocean floor half a billion years ago.
This is an artist's illustration of Tupandactylus navigans, a pterosaur that lived during the Early Cretaceous period 115 million years ago in what is now northeastern Brazil.
Fossils helped researchers discover that early mammals may have been more diverse than previously thought. The newly discovered species include (left to right) Conacodon hettingeri, Miniconus jeanninae and Beornus honeyi.
The cremated remains of a young woman (left) and her twin babies (right) were recovered from a 4,000-year-old grave in Hungary.