She's missing only a foot, one arm, and a few ribs and vertebrae. No one knows how T. rex used those tiny forelimbs. The first T. rex was unearthed in Wyoming by Barnum Brown in 1900. Dinosaurs evolved from a group of crocodile-like reptiles called thecodonts. Dinosaurs are party animals.
Paleontologists have a sense of humor.
When a group of them discovered that the skull they were studying had been incorrectly reconstructed, they were so annoyed they named the dinosaur Irritator. Small meat-eating dinosaurs like Deinonychus may have hunted in packs, killing and eating much larger animals. Some dinosaurs tended their nests and protected their young 5. Some meat-eating dinosaurs have hollow bones and wishbones just like their closest living relatives, the birds. For 150 million years, dinosaurs ruled the earth and no mammal got much larger than a house cat.