Tyrannosaurus rex, Triceratops, Apatosaurus, and Stegosaurus were some of the major dinosaurs that lived long ago according to the children's book "Dinosaurs Long Ago". Tyrannosaurus rex was a meat-eating dinosaur with 6-inch long teeth and a head as long as a man's body. Triceratops was a plant-eating dinosaur with three horns on its face that could be up to 40 inches long, while Apatosaurus was as long as two school buses and stayed in swamps most of the time. Stegosaurus walked on four legs and had bony plates on its back and four spikes on its