Ornitholestes was a theropod dinosaur of Late Jurassic (155-150 Ma) Wyoming. Its classification Coelurosaur shows it is closely related to birds. In both its appearances, it is shown to have a small crest at the end of its snout, however this theory has since been disproved. They were around 2 metres long, weighing 80-100 kg. They were the ancestors of dinosaurs like Utahraptor
Ornitholestes is shown as a carnivore, preying on baby Diplodocus. It is capable of finding and digging up the eggs, and is seen breaking them to feed on the nutritious material within.
The main specimen shown, was possibly killed in the forest fire during the episode, though this is not revealed, and if some heavy Diplodocus could escape, perhaps his lightweight theropod was was of the few more likely to escape (though in turn, a fleet-footed Hypsilophodontid is seen burnt also though this may have been ill as the other ornithopods ran acrossed the plains after this)