The history of the Dinosauria begins with one of the dinosaur's small extinct ancestors called Petrolacosaurus. Around 270 million years ago, this animal was a member of the group of ...
Asteriods, Dinosaurs, and Geology: Catastrophic Events and the Theory of Mass Extinction
Fossils were first determined to be the remains of extinct animals in the nineteenth century. This rea...
Were Dinosaurs Hot-Blooded Animals?
Viewpoint: Yes, the most recent fossil evidence indicates that at least some dinosaurs were hot-blooded animals.
Viewpoint: No, the long-standing view of dinosaurs ...