Psittacosaurus sp.
Lower Cretaceous, Barremian Stage
Yixian Formation
Liaoning, China

The psittacosaurids, known only from the late Early Cretaceous of Central Asia, are considered to be close to an ancestor of the horned dinosaurs. Both the parrot-beaked and horned dinosaurs possessed jaws, being curved and tapered foreward and the lateral teeth highly specialized to masticate the vegetative food. Psittacosaurids were relatively small, up to 2 meters in length, and mostly bipedal cursors although the forelimbs in these dinosaurs were relatively long and well-developed.