![]() ![]() Tyrannosaurus rex lived during the Late Cretaceous Period, about 72 million years ago. Stegosaurus, for example, lived during the Late Jurassic Period, about 150 million years ago. Dinosaurs evolved into a very diverse group of animals with a vast array of physical features, including modern birds.Ĭontrary to what many people think, not all dinosaurs lived during the same geological period. The earliest known dinosaurs appeared during the Triassic Period (approximately 250 to 200 million ago). Many of his greatest discoveries, including the first specimens of Tyrannosaurus rex ever found, are on display in the Museum’s dinosaur halls. He began his career at the American Museum of Natural History in 1897. Some consider Barnum Brown, who began his career at the American Museum of Natural History in 1897, to be one of the greatest dinosaur hunters of the late 19th and early 20th centuries. Early finds inspired legends and fairy tales, as people imagined that these bones belonged to giants or huge monsters. Those clues to what dinosaurs were like are found in fossils-the ancient remains of an organism, such as teeth, bone, or shell-or evidence of animal activity, such as footprints and trackways.Įverything we know about non-avian dinosaurs is based on fossils, which include bones, teeth, footprints, tracks, eggs, and skin impressions. For centuries, people throughout the world have discovered amazing fossilized bones and footprints. Paleontologists are like detectives who examine the evidence that extinct animals left behind. ![]()
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