Edmontosaurus Dorsal VertebraEdmontosaurus was a genus of Hadrosaurid "Duck Billed" dinosaur, a huge beast which roamed in herds across Western North America during the Cretaceous time period. At over 40 feet in length, Edmontosaurus was one of the largest dinosaurs. Its immense size was its natural defense against the carnivores during the time. Along with its massive size Edmontosaurus had an extremely long and heavy tail. The tendons in much of the Edmontosaurus back and tail