Edmontosaurus was a Hadrosaur from late Cretaceous North America, specifically, Canada. It was the fourth largest Hadrosaur, at 40 feet long and 20 feet tall, its size alone is enough to deter most predators, most. Edmontosaurus was one of the last dinosaurs, and unfortunately for it, Edmontosaurus was the main course on T. rex's menu. It had a very large tail to counterbalance it when it runs, and it can run fast. It is thought that Edmontosaurus can run up to 35 mph, which is enough to escape a Tyrannosaurus rex, but not its other predators. It lived before T. rex to, in a time where there where smaller and faster tyrannosaurs ready to rip its throat out. Of course, it also had to watch out for the raptors. It is believed that an Edmontosaurus was killed by a pack of Dromeaosaurus based off of a skeleton that had many little scratches most likely made by raptors.