It was in this environment that the reptiles known as dinosaurs first evolved. Reptiles tend to flourish in hot climates because their skin is less porous than, for example, mammal skin, so it loses ...

"When dinosaurs first appear in the fossil record, all the Earth's continents were part of the ... including large crocodile ...

"When dinosaurs first appear in the fossil record ... and various plant-eaters including elephant-sized ones related to mammals and four-legged armored reptiles. "Dinosaurs started small, playing ...