As the period came to a close, life-forms still common today filled ... the seas was the appearance of whales in the mid- to late Paleogene. The huge animals evolved from land mammals that took ...

Several factors contributed to the survival of crocodiles, turtles, lizards and birds 66 million years ago, say our readers ...

The chosen student's research will be funded by a NSF FRES Program award: Collaborative Research: Terrestrial Ecosystem Recovery after the Cretaceous/Paleogene Mass Extinction ... the last mass ...