This was the first dinosaur from North America to be named. Its bones were dug up in New Jersey, and in 1858 it was given a name that means "different foot." This became the family name for a large group of hadrosaurids. The family also included Edmontosaurus, which was much bigger and heavier than hadrosaurus.

All duckbills had flat heads with solid bone crests or humps on top. The shape and size of these features varied among different members of the family. Hadrosaurus had a deep, narrow face. It had two rounded humps, one above each eye socket.

Scientists have discovered fossil remains of Hadrosaurus that date back 78 million years, making Hadrosaurus older than Edmontosaurus. In fact, they were not very closely related. Both came from an unknown ancestor believed to have been on earth more than 80 million years ago. Some scientists, however, think both types were much older than this. They have found fossil footprints 120 million years old that look just like those made by Hadrosaurus.

Location: New Jersey, USA

Size: Length- 30 feet (9m)

Classification:

Family-Hadrosauridae
Suborder- Ornithopoda
Order- Ornithischia

Time: Late Cretaceous