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Allosaurus

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A scientific artist's reconstruction of the dinosaur Allosaurus fragilis, showing how this ancient predator might have looked in nature.

Allosaurus

Allosaurus was a big dinosaur that lived a very long time ago, about 155 to 145 million years ago. It lived during a time called the Late Jurassic period. This amazing dinosaur walked on two legs and had a long tail to help it balance.

Allosaurus was about as long as two school buses put together, maybe even a little longer! It had strong legs and sharp teeth. Its hands had three fingers, but they were much smaller than its legs. Scientists first found Allosaurus fossils in 1877, and it means “different lizard” because its bones were special and lightweight.

Allosaurus lived in places that are now North America and Portugal. It was one of the biggest hunters of its time, living among many other dinosaurs. People have found many fossils of Allosaurus, helping scientists learn more about this fascinating creature.

Images

A scientific model of the Allosaurus dinosaur on display at the American Museum of Natural History.
A historical painting from 1904 showing an Allosaurus, a type of dinosaur, feeding on a dead sauropod. This artwork is part of early scientific efforts to imagine how these ancient creatures might have looked and behaved.
Map showing where dinosaur bones were found at the Cleveland-Lloyd Dinosaur Quarry in Jurassic National Monument.
A fossilized skeleton of an Allosaurus dinosaur on display at a museum.
Cliffs showing important fossil locations where scientists discovered ancient dinosaur remains.
Scientific illustration of an Allosaurus skull shown from different angles.
Scientific illustration of the Allosaurus europaeus holotype fossil, showing detailed parts of the dinosaur skeleton.
Scientific illustrations showing the skulls of different Allosaurus dinosaur species.
Illustration of Allosaurus jimmadseni, a large theropod dinosaur from the Late Jurassic period known for its sharp teeth and wide jaw gape.
Scientific diagram and photo of an Allosaurus skull, showing detailed bone structure for learning about dinosaurs.
Scientific diagram showing the bone structure of the Allosaurus jimmadseni dinosaur.
Fossilized bone fragments of Allosaurus fragilis, an ancient carnivorous dinosaur.
Illustration of an Allosaurus skull showing different views, helping us learn about this ancient dinosaur.

Related articles

Late Jurassic

This article is a child-friendly adaptation of the Wikipedia article on Allosaurus, available under CC BY-SA 4.0.

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