
Ornitholestes (meaning `bird robber`) is a small theropod dinosaur of the late Jurassic (Brushy Basin Member of the Morrison Formation, middle Kimmeridgian age, about 154 million years ago) of Western Laurasia (the area that was to become North America). To date, Ornitholestes is known only from a single partial skeleton with a badly crushed sku.....
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http://en.wikipedia.org/wiki/Ornitholestes

small, lightly built carnivorous dinosaur found as fossils from the Late Jurassic Period (159 million to 144 million years old) in North America. ...
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http://www.britannica.com/eb/a-z/o/32

Ornitholestes was a dinosaur of the Jurassic period. It was a small, lightly-built carnivore, about two metres long, that walked on its hind-legs, standing about one metre tall. An almost complete skeleton of Ornitholestes was discovered in 1900 at Wyoming, USA. Ornitholestes had small teeth and rather weak hands and long, slim arms and legs.
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