A crew from the American Museum of Natural History found the first remains of Ornitholestes (or "bird robber") at Bone Cabin Quarry near Medicine Bow, Wyoming, in 1900. It is consisted of a skull and partial skeleton. This is the same quarry where workers found Apatosaurus, now mounted in the American Museum of Natural History.
H.F. Osborn briefly described Ornitholestes in 1903. In that paper, he aslo grouped a partial hand from the same quarry, but not the same animal, in the same genus. The skull is complete, though badly crushed. Serrated teeth line the jaws. The first tooth in the upper jaw is the largest. Ornitholestes may have had a small horn over its nose, but scientists are not sure.
The hands are not complete. If the partial hand of the other animal belongs to the same genus, the first finger was short, and the second and third fingers were much longer. Ornitholestes may have caputered and held its prey with its hand. All the fingers had sharp curved claws. The animal probably weighed about 35 pounds. For many years, scientists thought Ornitholestes and Coelurus were the same genus. In 1980, however, John Ostrom showed that they weren't. It lived alongside dinosaurs like Stegosaurus, Diplodocus, Dryosaurus, Ceratosaurus, and Allosaurus, and also pterosaurs like Rhamphorhynchus.
Height. 3 feet
Length. 7 feet
In Popluar Culture
Ornitholestes was in the famous documentary Walking with Dinosaurs, where one stalked and killed several baby Diplodocus and was chased off by the adults sauropods, Allosaurus, and Stegosaurus.
It was also featured in the documentary Dinosaur Revolution where one was killed by an angry Allosaurus mother, and another lived by a dried waterhole, chased around a Rhamphorhynchus, and was chased away by a sub-adult Allosaurus and Torvosaurus.
Ornitholestes also appears in the seventh episode of Primeval: New World, where its shown to resemble the design used for Walking with Dinosaurs and The Ballad of Big Al, and attacks the protagonists. It reappeared in the eleventh episode where it was shown dead after being subjected to many tests by Project Magnet.
A group of Ornitholestes appeared in The Land Before Time III: the Time of the Great Giving crossing a river.
General Description Credits to "ROMTECH" Computer CD Dinosaur Discovery
Walking with Dinosaurs