Camptosaurus

Camptosaurus dispar was a robust herbivorous dinosaur that roamed the floodplains and forests of Late Jurassic North America alongside giants like Allosaurus, Diplodocus, and Stegosaurus. This medium-sized ornithopod possessed a sturdy build with a relatively small head featuring a distinctive beak-like snout used for cropping vegetation. Its teeth were well-suited for grinding plant material, arranged in dental batteries that would become more sophisticated in its later descendants.

Capable of both bipedal and quadrupedal locomotion, Camptosaurus likely spent much of its time foraging on all fours but could rear up on its powerful hind legs to reach higher vegetation or flee from predators. Its forelimbs were notably robust with hoof-like digits, suggesting frequent use in walking. The hands retained some grasping ability, useful for pulling down branches.

First discovered by William Harlow Reed at Quarry 13 near Como Bluff, Wyoming, in 1879, Camptosaurus was named by Othniel Charles Marsh. The genus name references the flexibility observed in its vertebral column. Multiple specimens ranging from juveniles to adults have been recovered primarily from the Morrison Formation, making it one of the best-represented ornithopods of the Jurassic. As a basal member of the Ankylopollexia, Camptosaurus bridges the gap between small early ornithopods and the more derived iguanodonts of the Cretaceous, making it scientifically invaluable for understanding ornithopod evolution.