(Photo taken at Universal Studios "Jurassic Park" 4/12/07 by Scott Kinmartin)
T-Rex was a huge meat-eating dinosaur that lived during the late Cretaceous period, about 85 million to 65 million years ago. T-Rex lived in a humid, semi-tropical environment, in open forests with nearby rivers and in coastal forested swamps. The seasons were mild.
Until recently, Tyrannosaurus Rex was the biggest known carnivorous dinosaur; Giganotosaurus and Carcharodontosaurus are slightly bigger.
Featured in WIRED: "6 Surprising New Tyrannosaurs Discovered This Year"