The earliest evidence of spiders' fangs has been identified in a 518-million-year-old fossil by scientists at the University of Leicester and Yunnan University.

Megalodon’s enormous size is estimated from limited fossils, including vertebrae and teeth. (lexaarts/Creatas Video+/Getty Images Plus) In 1978, a wonder emerged from the crumbling earth of the Gram Clay Pits in Denmark.

Tiny fossil teeth from Alaska are changing how scientists view mammal life and migration in the ancient Arctic.

Fossils tucked away in a museum drawer and identified merely as "feline" are actually from a very ancient and enigmatic saber-toothed cat that inhabited North America more than 5 million years ago. Newly identified by a UC Berkeley paleontologist,

Scientists studied the remains of a mysterious human relative called Homo naledi found deep in a South African cave and determined they were all female.

Tiny fossil teeth discovered in Colorado reveal new clues about Purgatorius, the earliest known primate relative, reshaping scientists' understanding of human evolution. These ancient mammals spread across North America soon after the dinosaurs disappeared.

An analysis of fossil teeth from mammals that lived in China following the most recent major mass extinction suggests size came before both shape and function as diets diversified.