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Until recently, it was thought that Spinosaurus was 39 feet (11.9 meters) long, and probably weighed 7 tons. However, new research published in 2006, suggests that some Spinosaurus were as much as 51 feet (17 meters) long and could have weighed 9 tons: This would make Spinosaurus the largest known carnivore,
Spinosaurus had 6 feet (1.8 meters) spines on its back, forming a large fin (sometimes also called "sail"). The fin was probably used for temperature regulation: the animal could face it towards or away from the sun, depending on whether it needed to heat up or cool down. The creature's name comes from this feature: Spinosaurus means "spine lizard".
Spinosaurus also had surprisingly large arms, compared to related carnivores, so it is possible that it may have been able to walk on all fours.
Spinosaurus was a carnivore (meat-eater) that lived from 95 to 70 million years ago
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