Dinosaurs, Non-dinosaur Ancestors Coexisted

The two carnivorous dinosaurs and two dinosaur ancestors discovered at Ghost Ranch, New Mexico, by UC Berkeley and American Museum of Natural History scientists. In the rear is an unidentified coelophysoid dinosaur, and in front of that, the dinosaur Chindesaurus bryansmalli munching on an animal that is an ancestor of today's crocodiles. The two dinosaur precursors are in the foreground: a quadrupedal herbivore similar to Silesaurus and, in the very front, the newly described Dromomeron romeri. (Drawing by Donna Braginetz for UC Berkeley, courtesy of Science magazine)