Harpymimus (Greek for "Harpy mimic"); pronounced HAR-pee-MIME-us
Plains of central Asia
Early Cretaceous (135-125 million years ago)
Size and Weight:
About 13 feet long and 200 pounds
Long, narrow skull; teeth on lower jaw
As you might expect from an early ornithomimid ("bird mimic") dinosaur, Harpymimus had some primitive characteristics that set it apart from late Cretaceous relatives like Ornithomimus and Struthiomimus, chief among them a scattering of teeth along its lower jaw. (Oddly enough, the only other toothed ornithomimid, Pelecanimimus, had a whopping 220 teeth--the most of any theropod, let alone ornithomimid, yet discovered.) Since it's currently believed that Harpymimus was directly ancestral to later ornithomimids, one can only conclude that the subsequent de-evolution of teeth was an adaptation to an omnivorous diet consisting mainly of insects and small animals (which didn't need to be chewed).