Edmontosaurus was a hadrosaurid or duck-billed dinosaur – so called because of its beak. Its hindlimbs were longer than its forelimbs, allowing it to move about on two legs as well as four.
Edmontosaurus preferred coastal plains around the Western Interior Seaway, the large inland sea that divided North America during the Cretaceous period. They also lived near the North Pole and are thought to have migrated long distances in search of food and breeding grounds.
Edmontosaurus might have been able to hear low-frequency sound, because other hadrosaurs that vocalised from tuba-like crests were able to hear in this way.
Edmontosaurus beaks were toothless like those of modern birds. They did, however, have teeth in their upper cheeks and main jaw bone. These held batteries of replacement teeth in columns of up to six per row.
We suspect that hadrosaurs lived in herds because their fossils are often found in huge bone beds. For instance, in one 40 hectare subsection of the Lance Formation in eastern Wyoming, between 10,000 and 25,000 individuals were discovered. As a result of this find, we think that they moved in herds of thousands. Hadrosaurs are often referred to as the 'cows of the Cretaceous'.
Height: 4m (13.12ft)
Length: 12m (39.36ft)
Weight: 4 tonnes (4.48 short tons)
Top speed: 50kph (31.06mph)
Vision: Hadrosaurs, the group that includes Edmontosaurus, had large eyes, controlled by large optic nerves, for detecting predators. They would have needed this good eyesight even more during the dark polar winters.
Skin: Edmontosaurus had thin and leathery skin with small overlapping scales, like a gila monster.
Brain: Edmontosaurus' brain cavity was a quarter of the length of its skull and its brain might have taken about 50% of this space.
Prey: Edmontosaurus was once thought to have been an aquatic animal, feeding on molluscs and crustaceans. Today, scientists think they would have been grazers, feeding close to the ground, or browsers, eating leaves from trees.
Bite: Edmontosaurus jaws are thought to have moved in a unique and complicated but repetitive way. They chewed with up-and-down, side-to-side and front-to-back movements. With this complex chewing action, as well as a large fermenting gut, Edmontosaurus had no problem digesting plants.
Nest: Edmontosaurus would have laid eggs in a distinct nest, although they were too large to sit on their eggs as some dinosaurs did. Instead they might have covered their eggs in vegetation, like modern crocodiles.