Hadrosaurus, meaning “sturdy lizard”, is a genus of hadrosaurid dinosaur from the Late Cretaceous Era that lived in what is now North America. Only one species is known: H. foulkii. It was discovered by John Estaugh Hopkins in 1838 while digging in a marl pit along the Cooper River in Haddonfield, New Jersey. He put the bones he discovered on display in his home, and in 1858, the remains sparked the interest of a visitor who went and recovered the rest of the fossilized remains in the marl pit. That same year, the species was named by paleontologist Joseph Leidy. He described the dinosaur in 1860, but his findings were not published until 1865 due to the American Civil War.

The dinosaur skeleton was completely assembled in 1868 and put on display at the Philadelphia Academy of Natural Sciences. Though normally kept out of the public’s eye, the skeletal display was open to the public from November 22, 2008 until April 19, 2009. Hadrosaurus was the first ever mounted dinosaur and became the state dinosaur of New Jersey in 1991. A statue replicating the Hadrosaurus now stands in the center of the town Haddonfield, commemorating its discovery there.

This was a bipedal dinosaur capable of running on its hind legs, but also using its forelimbs for support while grazing. Hadrosaurus was a herbivore. Its teeth indicate that it mostly ate twigs and leaves.

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