Hypsilophodon

Hypsilophodon lived in the Early-Mid Cretaceous period of every continent, and was very similar to the earlier Othnielia, which lived only in North America.

In Jurassic Park
Hypsilophodon was one of the several species of Dinosaur featured in the Jurassic Park novel. There were 34 of them on Isla Nublar at the beginning of the novel, but their numbers were greatly reduced to 14 when the park reached equilibrium. It was probably in the same paddock as the Othnielia, given how much they were alike. It was a small bipedal animal with a herbivorous or possibly omnivorous diet. These dinosaurs are incorrectly depicted as being tree-dwellers (similar to the first restorations of this dinosaur); in real life they were perfectly adapted for fast running in the open. It has not been confirmed that it is even portrayed this way in-canon, but since Tim identifies a green dinosaur in a tree as an Othnielia, and Othnielia are later revealed to be similar in colour to the striped raptors, it can be assumed this was a misidentified Hypsilophodon.

The Lost World
Hypsilophodon was first seen on the marshy plain by the river to the south with the other herds of dinosaurs. The Hypsilophodons were described as medium-sized, dark-green, lizard-like or gazelle-like animals, having perhaps 20 members in it's herd, and intermittently poking their large heads up above the grass along the river.

Later on, as Sarah Harding regained consciousness and made her way through the island's jungle she encountered a herd of panicked, dark-green, lizard-like animals about four feet high that were running and leaping away from an attacking Velociraptor pack. Their panicked cries were reminiscent of yelping dogs. One of the animals knocked Sarah to the ground, but Sarah escaped the stampede by climbing onto a tree branch. One of the animals was taken down by the Raptor pack. Based on their description the animals in the herd were most likely Hypsilophodon.

Jurassic Park video games
Hypsilophodon appears in the Game Boy Advance game Jurassic Park III: Park Builder.