World Dinosaur

Dinosaurs and the Red Queen

Posted from Laelaps 118 days ago
Dinosaurs! : Dinosaurs

Hadrosaurs are often called the "cows of the Cretaceous." They were common, had few defenses compared to their armored ornithischian kin, and were a favorite prey for predatory dinosaurs. Natural selection appears to have applied sufficient pressure for at least one genus of hadrosaur, Hypacrosaurus, to change, however. It did not develop horns or spikes or a club, but instead ontogenetically outpaced their predators. The key to determining how theropods and Hypacrosaurus grew can be found inside their bones, and a new study in the Proceedings of the Royal Society B using histological eviden... (original story)