Dinosaur encyclopedia
A guide to fossils, anatomy, size and the methods used to reconstruct the animals of the Mesozoic.
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Tyrannosaurus rex
Large tyrannosaurid from western North America, about 68–66 million years old.
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Small feathered dromaeosaur from the arid environments of Late Cretaceous Mongolia.
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Compare representative lengths and masses without hiding the uncertainty behind each estimate.
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