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Spinosaurus was a bipedal (it walked on two legs), about 40-50 feet long (12-15 m) and weighed 4 tons or more; it is the largest known carnosaur (a type of meat-eating dinosaur); had a large head with sharp, straight, non-serrated teeth in a powerful, crocodile-like lower jaw. The spinosaurus arms were smaller than its legs but were larger than the arms of most other theropods and may have walked on all fours at times. Spinosaurus is called "spiny lizard" because it had a series of large neural spines up to 6 feet (1.8 m) long coming out if its back vertebrae, probably forming a sail-like fin that may have helped in thermo-regulation, mating rituals and/or intraspecies rivalry. Spinosaurus had a relatively flexible upper spine (these vertebrae had modified ball-and-socket-joints) so it could arch its back somewhat, perhaps being able to spread the sail (like opening the ribs of a fan). They lived during the late Cretaceous period, about 98 to 95 million years ago in the tropics near sea level.

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Spinosaurus Dinosaur

Spinosaurus 40-50 feet long and weighing 4 tons

Spinosaurus tooth fossil

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