JOE TUCCIARONE / SCIENCE PHOTO LIBRARY JOE TUCCIARONE / SCIENCE PHOTO LIBRARY
Allosaurus dinosaur. Artwork of an Allosaurus dinosaur (Allosaurus sp.). Allosaurs were large predatory dinosaurs during the Jurassic and Cretaceous periods, between 65 and 200 million years ago. Allosaurs reached around 11 metres in length and two tonnes in weight. They were characterised by powerful hindlimbs and short forelimbs, both with three claws, and by teeth with serrated edges. Their powerful, muscular tail was used for balancing purposes. Opinion differs as to whether these large carnivores hunted alone or in packs.
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