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Authentic Hadrosaur Dinosaur Fossil Bone
From the Late Cretaceous Hell Creek Formation
of South Dakota, 67-68 Million Years Old
Comes With Free 8 x 6 x 3/4 Inch Riker Display Case
Hadrosaurs (meaning "bulky lizards") were the family of duck-billed herbivorous dinosaurs. They were the most common dinosaur.
Hadrosaurs ranged in size from 10 to 65 feet (3 to 20 m) long. They had horny, toothless beaks and hundreds of cheek teeth in the sides of their jaws. The duck-billed dinosaurs had the most teeth; they had up to about 960 cheek teeth. Hadrosaurs lived during the later Cretaceous, and their fossils have been found in North America, Europe, and Asia.
Hadrosaurs had a stiff tail that was probably used for balance. They had hoof-like nails on their feet, and bumpy skin. They ran on two legs, holding their tail and head in a horizontal position. They may have walked on all four legs while grazing. Hadrosaurs probably lived near bodies of water, migrating to high ground to lay eggs. It used to be thought that they had webbed hands, but this was an artifact of the fossilization process.
It is very interesting Robert Bakker says, the duckbills were so common, yet they had no obvious defense against the large carnivores. Perhaps herd organization and running speed were sufficient. Their eating apparatus must have been an advantage as compared to other herbivores.
Some 61 species of Hadrosaurs are known including Edmontosaurus, Hadrosaurus, Maiasaura, Corythosaurus, Lambeosaurus, Parasaurolophus, Shantungosaurus. Shantungosaurus giganteus from China a 15 meters in length and nearly 16 metric tons in weight it is the largest known hadrosaur and is known from a nearly complete skeleton.
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