This dinosaur plushie comes with an educational hang tag! Edmontosaurus was one of the duckbilled or hadrosaur dinosaurs. Edmontosaurus was up to 42 feet long, about 10 feet tall at the hip, weighed 3.5 tons, and was easily 16 to 18 feet tall when erect. This dinosaur was a biped that could also walk on all four legs perhaps to graze on low-lying plants. Edmontosaurus may have lived in large herds for protection from the largest predator of the day, Tyrannosaurus rex. This species was one of the last of the dinosaurs and is 67 to 65 million years old.