For the first time, paleontologists have identified cavities in the bones of a dinosaur from the Alvarezsauridae family. This finding sheds new light on the evolution of avian characteristics ...

Clues from teeth and other bones show that there were four youngsters. But even among the nine adults, body size varied widely. Males were much bigger than females, like male gorillas today who ...

Fossils of alvarezsaurid dinosaurs show bird-like air sacs in their bones. Scans revealed hollow spaces connected to their ...

Brazilian paleontologist Tito Aureliano found that hollow bones filled with little air ... Every time an animal reproduces, evolution throws up random variants in genetic code.

Long before the asteroid hit Earth and wiped out the dinosaurs, many mammals had already started living on the ground, ...

Lucy's foot bones show that she had similar feet to modern humans but with much more curved toes. Many human-like fossils that provide additional evidence for human evolution were found by the ...