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Allosaurus is a medium-sized carnivorous dinosaur. It is 8.5 meters long, 9.7 meters in maximum, weighs 1.5 to 3 tons, and heaviest 3.6 tons. They lived in the late Jurassic, from about 155 million years to 135 million years ago. Since being named by Othniel Charles Marsh in 1877, many possible species have been classified under the Allosaurus genus, but only a few are considered valid species. Allosaurus is very clever and will besiege large prey. It is a huge, fierce carnivorous dinosaur.