Allosaurus, meaning 'Different Reptile'
About 12 metre (39ft)
3m (10 ft)
About 2000kg (4400lb)
Fossils have been found in parts of Northern America, Europe, Africa and Australia
Carnivore eating meat including large Sauropod plant eaters
Late Jurassic about 140 million years ago
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Allosaurus was a large saurischian (lizard hipped) bi-pedal dinosaur that lived during the late Jurassic period about 140 million years ago. Allosaurus was a large predator that hunted in packs; it was probably a more efficient killer than Tyrannosaurus Rex that lived much later during the Cretaceous period.
Allosaurus was the biggest carnivore that lived in North America during the Jurassic Period. Allosaurus had two short arms, but longer than those of T-Rex, each one having three long and sharp claws that could tear lumps of flesh from its prey. It was a large muscular animal with strong heavy bones, small bony knobs and ridges above the eyes and a powerful jaw lined with sharp teeth. Its vertebrae weren't the same as other dinosaurs, which is where it gets its name from, meaning 'different lizard'.
Allosaurus preyed upon other animals and would have probably been a scavenger as well, feeding off animals that had died or been killed by other carnivores. Its prey would have included Stegosaurs and Iguanodons, and possibly even the large Sauropods such as Apatosaurus and Diplodocus.
Fossils have mainly been found in North America but a few have also been found in Europe and Africa and possibly one specimen in Australia.