Dinosaurs
Explore classification, origins, appearance, behavior, observation and care through the published animal profiles for dinosaurs.
Browse categories
Theropods and Dinosaurs Close to Birds
Explore carnivorous theropods, plant-eating lineages and dinosaurs closely related to birds together. These animals did not all share the same food, feathers or flight ability. Distinguish structures confirmed by fossils, ecological inferences and artistic reconstruction.
Ornithischian Dinosaurs
Explore several ornithischian lineages, including ornithopods and pachycephalosaurs as well as armored dinosaurs. Not all had armor or horns, and body structure, diet and movement differed. Distinguish each entry's fossils and discovery records from evidence used to infer ecology.
Sauropods
Explore sauropod dinosaurs with long necks and large four-legged bodies. Body size and neck-to-tail proportions differ by species, and figures estimated from incomplete specimens have ranges. Compare evidence for diet and movement while checking the difference between skeletal specimens and reconstruction material.
Published animal profiles
Tyrannosaurus
Reading Tyrannosaurus’s huge jaws and bipedal movement from fossils. Tyrannosaurus rex was a tyrannosaurid theropod living in North America near the end of the Late Cretaceous. Known through bones and teeth from Canada and the United States, it lived at a different time from Jurassic Allosaurus.
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Triceratops
A latest-Cretaceous ceratopsian with three horns and a broad frill. Triceratops was a ceratopsian dinosaur living in Late Cretaceous North America. Its name refers to a three-horned face, taken from the long horns above the eyes and the horn above the nose.
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Brachiosaurus
A sauropod distinguished by long forelimbs and high shoulders. Brachiosaurus was a sauropod dinosaur living in Late Jurassic North America. This page focuses on the North American Brachiosaurus altithorax.
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Stegosaurus
A stegosaur whose back plates and tail spikes merit separate attention. Stegosaurus was a stegosaurian dinosaur of the Late Jurassic. A representative herbivore known from North America's Morrison Formation, it did not live at the same time as the latest-Cretaceous Tyrannosaurus.
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