Sign up for free

Newsletters

Once a month
get new photos
and expert tips.

Science and Space
Main Health and Human Body Earth Environment Space Prehistoric World A-Z

Dinosaur Siege

A pack of aucasaurs, predators of Argentina's Auca Mahuevo badlands, attacks a group of startled titanosaurs in this artist's depiction. Scientists believe Aucasaurus probably attacked in packs, pushed past adult titanosaurs guarding nests, and picked off baby titanosaurs as they hatched.

Artwork by John Sibbick