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Millions of years ago, long before humans first appeared, the worldbelonged to the dinosaurs. These magnificent reptiles ruled theearth for around 160 million years before disappearing inmysterious circumstances about 65 million years ago. Dinosaurscame in all shapes and sizes, from the huge, long-neckedBrachiosaurus (brak-ee-oh-SORE-us), taller than six adults,to the scurrying chicken-sized Compsognathus (comps-sog-NAYTH-us). However, one stands out from all therest, the world's most famous dinosaur species,Tyrannosaurus rex (tie-RAN-o-SORE-usrex). But what was this dinosaurreally like? Was it as fearsome asit first appears? What did ?it eat? How fast could it 'run? What color was it?These are all questions which people are stilltrying to answer today.big boyTyrannosaurus rex was the Largest of theTyrannosaur family of dinosaurs which Livedin North America around 85 to 65 millionyears ago. Tyrannosaurus rex was also oneof the biggest carnivorous, or meat-eating,dinosaurs ever discovered. It measuredover 45 feet from nose to tail, wasalmost 14 feet highthough if itstretched up, T. rex could havereached up to 20 feet. It weighedbetween 6 and 8 tons, too, whichmeans it was heavier that an elephantand longer than two minivans.