Eric Walker added Tyrannosaurus to Tyrannosaurinae, and added Tyrannosaurinae to Tyrannosauridae

Eric Walker added Tyrannosaurinae to Tyrannosauridae, and added Tyrannosauridae to Theropoda

Eric Walker added Tyrannosauridae, Aves and Abelisauridae and a number of links to Theropoda, and added Theropoda to Saurischia