Dryosaurus had a long neck, long, slender legs and a long, stiff tail. Its 'arms', however, with five 'fingers' on each "hand", were short. It was about five feet (1.5 m) tall (at the hips) and weighed about 170 to 200 pounds (80 to 90 kilogram|kg). Its eyes were quite large, leading many to believe that it possessed excellent eyesight.
Dryosaurus had a horny beak and cheek teeth and, like other ornithopods, was a herbivore. Some scientists suggest that it stored food in its cheeks. It was probably a herd animal, which raised and protected its young after hatching.
A quick and agile runner with strong legs, Dryosaurus used its tail as a counter-balance. It probably relied on its speed as a main defense against carnivorous dinosaurs.
Its intelligence, as measured by its EQ, (Encephalization Quotient) (brain-to-body ratio), was midway when compared with other dinosaurs.
In the Walking With Dinosaurs Special: The Ballad of Big Al, Dryosaurus are one of the herbivorous dinosaurs.
Dryosaurus also appeared in the special When Dinosaurs Roamed America where it was preyed upon by a Ceratosaurus.
They were also featured in one of the Jurassic Park video games, Jurassic Park: Operation Genesis.