Nanosaurus

Othnielia was a small herbivorous ornithopod dinosaur that lived 150 to 140 million years ago, in the Late Jurassic. It was discovered in the late 1800s by men working for Othniel Charles Marsh, for whom it was soon named after. Ironically, Othnielia‘s closest relative, Drinker, was named for Marsh's archrival, Edward Drinker Cope. Recently, the type specimen of Othnelia was deemed nondiagnostic, meaning the animal portrayed in the novel is the animal now known as Othnielosaurus.

Jurassic Park (novel)
Othnielia was seen in the novel version of Jurassic Park. It lives side by side with its relative Dryosaurus in the Hypsilophodon Highlands. Before the InGen Incident, an Othnielia got its neck stuck in between the branches of a tree where it died of suffocation. The park hosted a population of 23 Othnielia.

Othnielia is portrayed as a half-arboreal herbivore, a view about the smaller ornithopods that has recently been disproved. Because the Othys spend so much time in the trees they were impossible to accurately track with the motion sensors. They're always jumping their fences. This explains why there are so much more Othys than expected. The expected population was 16, but there are 23.

It apparently had a colour similar to that of the novel's Velociraptors, as when Tim saw a Velociraptor in the Othnielia paddock, the adults thought he had mistaken an Othnielia for a raptor.

Later in the novel Muldoon states that the Othnelia scavenged on the dead hadrosaur either Maiasaura or Parasaurolophus. This was likely a mix-up with the Compys, as Othnielia was an herbivore in reality or this could have been a nickname for the Procompsognathus.

In The Lost World (novel), Ian Malcolm hears jumping in the jungle trees, and when the group thinks monkeys, Malcolm disagrees. It is probably Othielia hopping throughout the foliage.

Jurassic Park inspired games

 * Othnielia appears in Jurassic Park III: Park Builder. It is nr. 75 of the Herbivore Ones.
 * It is a relative of Dryosaurus, a one-star small herbivore in Jurassic Park: Operation Genesis.