Cretaceous Period

New research suggests that the size of eggs laid by ancient marine creatures may explain why ammonites went extinct while nautiloids survived the asteroid impact that ended the Cretaceous period.

A 100-million-year-old snake fossil from Argentina, *Najash rionegrina*, reveals hind legs and a cheekbone, challenging previous theories on snake evolution.

A 100-million-year-old fossil in amber has revealed a new true bug species, *Carcinonepa libererrantes*, possessing rare crab-like claws on its front legs.