LAURIE O'KEEFE / SCIENCE PHOTO LIBRARY LAURIE O'KEEFE / SCIENCE PHOTO LIBRARY
Tyrannosaurus rex, the king of tyrant lizards, was one of the largest terrestrial predators in existence with heights of 20 feet and lengths of 49 feet. This theropod lived in North America during the Late Cretaceous period of the Mesozoic Era (approx.
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