Ornitholestes ("Bird Thief") is a genus of theropod dinosaur which lived during the late Jurassic period in what is now North America. (150-139 MYA)
Ornitholestes was a small predatory dinosaur, about two-meters long, only the size of a man. It was also closely related to the dinosaurs the one day evolved into birds.
Ornitholestes lived in the forsets of the Jurassic and normally hunted small lizards, birds, and mammals, but a dinosaur hatcheling was an extra treat. And female Ornitholestes were over protective of their nest, scaring of even a two year old Allosaurus.
Ornitholestes also hunted and lived alone or in pairs.