Edmontosaurus lived in the Late Cretaceous period and inhabited North America, dating from approximately 66 to 74 million years ago. Its fossils have been found in places such as Montana, Nebraska, and New Jersey. Edmontosaurus, named after Edmonton, Canada, was one of the more common of the hadrosaurs. Edmontosaurus is a flat-headed duck-billed dinosaur and also a fairly large dinosaur. It was approximately 42 feet long, 10 feet high at the hips and probably weighed around 3 to 4 tons, the same size as Tyrannosaurus. Edmontosaurus was a herbivore and probably lived off plant material such as ginkgos, conifers, and cycads. It had a toothless beak which would have been perfect for crushing this sort of plant material. Hard conifer needles, twigs and speeds have been found in Edmontosaurus stomachs. Mummified specimens have some preserved skin, so we know its texture but not the color. Apparently, it was also prey for T. rex, because at least two specimens show that it had been bitten and survived. Once threatened by the T-Rex, it loves hanging out in herds and munching on conifers and other vegetation. An interesting fact about Edmontosaurus is that is may have had loose skin around its fact that it could blow up like a balloon. It might have done this to attract a mate or to ward off other males in intraspecies contests that likely arose between competing males. Since its initial discovery, this dinosaur has been found all over North America. This suggests that these dinosaurs were probably nomadic and may have even traveled in large herds for protection from the apex predators of their day. You can see this dinosaur in the Oxford University Museum of Natural History.