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Allosaurus fragilis

The razor-toothed Allosaurus as seen in Dinosaurs in Their Time at Carnegie Museum of Natural History. This giant meat-eating dinosaur once roamed the world 150 million years ago, long before Tyrannosaurus rex appeared. With razor-sharp teeth, hooked claws, and jaws that could expand to bite huge mouthfuls of flesh from victims, Allosaurus was one of the Jurassic Period’s ultimate hunters.

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Diplodocus carnegii and Apatosaurus louisae

The majestic Diplodocus carnegii and Apatosaurus louisae, among the largest species of dinosaurs ever to walk the Earth, tower over visitors in Dinosaurs in their Time at Carnegie Museum of Natural History. Diplodocus and Apatosaurus were discovered in 1899 and 1909 respectively. Diplodocus carnegii is named after Andrew Carnegie, while Apatosaurus louisae is named after Carnegie’s wife, Louise.

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Protoceratops hellenikorhinus

This small dinosaur is believed to be an early relative of the famous Triceratops. Protoceratops lived about 80 million years ago during the Cretaceous Period in what is now Mongolia. The skeleton on display may be that of an immature male, and can be seen in Dinosaurs in Their Time at Carnegie Museum of Natural History.

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Camptosaurus aphanoecetes

Camptosaurus as seen in Dinosaurs in Their Time at Carnegie Museum of Natural History. This plant–eating dinosaur lived late in the Jurassic Period about 150 million years ago.

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Dryosaurus altus and Ceratosaurus nasicornis

The quick and evasive herbivore Dryosaurus attempts to escape the snarling jaws of Ceratosaurus. Both dinosaurs lived about 150 million years ago. Dryosaurus was a nimble plant–eater, while Ceratosaurus was a formidable predatory dinosaur. Both can be seen in Dinosaurs in Their Time at Carnegie Museum of Natural History.

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Diplodocus carnegii

The colossal Diplodocus carnegii exhibited among the plants and dinosaurs that lived 150 million years ago in what is now the western United States. Diplodocus was the first dinosaur ever discovered by Carnegie Museum paleontologists on July 4, 1899 in Wyoming. It can now be seen in Dinosaurs in Their Time at Carnegie Museum of Natural History.

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Stegosaurus armatus

Known as one of the largest plated dinosaurs, the massive Stegosaurus armatus stands ready to defend itself in Dinosaurs in Their Time at Carnegie Museum of Natural History. It lived about 150 million years ago and could grow as big as a bull elephant, making Stegosaurus the largest known plated dinosaur. This specimen was first found in Utah by Carnegie Museum’s Earl Douglass and crew between 1920 and 1922.