Rapid evolution is most consistent with "sexual selection" acting on the dinosaurs, say scientists. Co-author Dr. Jingmai O’Connor, of the Field Museum, Chicago, added: “Sexual selection ...

Cerapodan body fossils, however, have been harder to come by. For some time, the oldest example was a 164-million-year-old ...

The discovery is significant as it enhances our understanding of theropod evolution ... type that experienced rapid growth after hatching. "There is great diversity in dinosaur eggs in terms ...

For larger things, such as big dinosaur bones, fossilisation can take thousands ... Ammonites make great index fossils due to their rapid evolution and wide distribution. So do trilobites. Trilobites ...

That's enough to draw an inference for most mammals during that era, according to Caleb Brown, curator of dinosaur systematics and evolution at ... sediments and very rapid burial," Brown said. " ...

Faced with an evolving group of competing organisms -- the mammals -- perhaps dinosaurs were driven to extinction by competition. Packs of small mammals would have competed with dinosaurs for food.

That's just a guy wearing a raptor glove and reaching around. Narrator: The "Jurassic" movies have constantly innovated how dinosaurs appear on-screen, pushing CGI forward while never exclusively ...