Lived from: 66 to 68 million years ago during the cretaceous period in the western United States, including these two, Montana and Wyoming.
Many T-rex spent two-thirds died around the age of twenty-eight, though some did die at the age of 20.
Tyrannosaurus is a genus of coelurosaurian theropod dinosaur. The species Tyrannosaurus rex, often called T. rex or colloquially T-Rex, is one of the most well-represented of the large theropods. Tyrannosaurus lived throughout what is now western North America, on what was then an island continent known as Laramidia
Stegosuarus, from Greek "Stegos" which means roof and "suarus" which means lizard, is a genus of herbivorous thyreophoran dinosuar.