Creature information
Scientific name : Dryosaurus altus
Name meaning : Oak lizard
Time period : Late Jurassic period
Primary diet : Herbivore
In the programmes
Appearances : Walking with Dinosaurs (Time of the Titans)
The Ballad of Big Al
In the books

Dryosaurus is a genus of ornithopod dinosaur (an iguanodont to be specific), which lived during the late Jurassic period (160-140 MYA) in what is now North America and Africa.


Dryosaurus had a long neck, long, slender legs and a long, stiff tail. Its arms, however, with five fingers on each hand, were short. Known specimens were about 8 to 14 feet (2.4 to 4.3 m) long and weighed 170 to 200 pounds (77 to 91 kg). However, the adult size is unknown, as no known adult specimens of the genus have been found.

Dryosaurus had a horny beak and cheek teeth and, like other ornithopods, was a herbivore. Some scientists suggest that it had cheek-like structures to prevent the loss of food while the animal processed it in the mouth.

A quick and agile runner with strong legs, Dryosaurus used its stiff tail as a counterbalance. It probably relied on its speed as a main defense against carnivorous dinosaurs, even though it was an iguanadont, it lacks thumb spikes.

Appearances in the programmesEdit

Walking with DinosaursEdit

Time of the TitansEdit

Though not identified, an ornithopod remarkably similar to Dryosaurus appeared several times as a background animal in the episode, and is presumably this animal.

The Ballad of Big AlEdit

A flock of Dryosaurus was seen numerous times. One notable appearance was when the flock was escaping Big Al. They escaped as a tree branch collapsed in front of Al and tripped him up, leading to his eventual death.


  • In Walking with Dinosaurs, Dryosaurus had two color schemes. One was nearly identical to that of the Othnielia in The Ballad of Big Al, the other was identical to the Dryosaurus in The Ballad of Big Al. It is possible that the first Dryosaurus were actually Othnielia while the second are Dryosaurus.


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