Hadrosaur Bone, Judith River Formation, Montana, U.S.A. (No.115)

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Hadrosaur Bone, Judith River Formation, Montana, U.S.A. (No.115)Hadrosaur Bone, from Judith River Formation, Montana, U.S.A.
Upper Cretaceous Period, 80 Million Years

Measurements Approx.
Height - 1.5 cm
Width - 2.1 cm
Length - 5.2 cm

Hadrosaurs ("duck billedí dinosaur) were a group of herbivorous dinosaurs from the Cretaceous period.  Descended from Iguanodon-like ancestors, these dinosaurs as the name suggests had a duck-bill like mouth, which varied in shape depending on their diet, they had multiple rows of cheek teeth, which were used as a grinding surface. 

Some had crests on top of their heads, this is much discussed as to its purpose. Its use as a social function being widely accepted, possibly in courtship or communication such as warnings and through some fossil finds it thought that Hadrosaurs had good eye sight and hearing. With a lack of obvious defences itís generally considered to be living in large herds, running at speed from large carnivores, such as T-Rex.