Learn how egg size may help explain why ammonites didn’t survive the end-Cretaceous extinction 66 million years ago, while ...

A new study challenges long-held ideas about why ammonites vanished while nautiloids survived the end-Cretaceous extinction. Researchers found that the few ammonite species that briefly persisted had ...

Ancient clues, in the shape of fossils and archaeological evidence of varying quality scattered across Australia, have formed the basis of several hypotheses about the fate of megafauna that vanished ...

Extinction risks are greater for animals at the small and large ends of the scale. Credit: Oliver Day, Oregon State University Extinction risks are greater for animals at the small and large ends of ...