psittacosaur n primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind limbs and short forelimbs; may have been bipedal Usage(s) On closer examination, the scientists determined that the remains were those of a juvenile psittacosaur, a herbivore known to inhabit the region. Synonym(s) psittacosaurus
Quotes psittacosaur Paul Sereno in msnbc.com And more nutty evidence: "The psittacosaur at hand has a huge pile of stomach stones, more than 50, to grind away at whatever it eats, and this is totally out of proportion to its three-foot body length," Sereno said.