The study of fossils, as from a T-rex
The species 
Tyrannosaurus ..... One study suggests that the rarity of juvenile Tyrannosaurus 
rex fossils is due in part to low juvenile mortality rates; the animals were not dying 
in... [DOC] [TLE] Tyrannosaurus Rex: Facts about T. Rex, King of the Dinosaurs [PAR] Mar 14, 2016 ... T. rex fossils are found in western North America, from Alberta to Texas.