Psittacosaurus

Psittacosaurus is a small early Marginocephalian from the Early Cretaceous. It lived in what is now Asia. It is known from a number of well preserved skeletons, which represent about eight different species.

Psittacosaurus was one of the smallest and most primitive of the Marginocephalians. It lacked the well-developed frill and horns that were typical of more advanced forms, yet, along with the hard keratinous beak, it had the characteristic skull shape of a ceratopsian. In fact, Psittacosaurus is now believed to be an ancestor of the larger, more advanced horned dinosaurs.

Psittacosaurus‘ hindlimbs were longer-although only slightly-than its forelimbs, which suggests that it could have moved about in an upright position for short distances. In 2002, quills were found in Psittacosaurus‘ tail, possibly suggesting that these quills were present in all later ceratopsians.

An extraordinarily well preserved Psittacosaurus with skin covering much of its skeleton was discovered. Large parts of the skin were preserved as a thin dark layer, where the skin has been transformed into a dark carbonized matter.

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Jurassic Park: Dangerous Games
In Dangerous Games, Psittacosaurs were seen in groups/or in nests, and were extremely protective to its infants, lashing out at Agent Espinoza when he stumbles upon their nest at the hydroelectric plant on Isla Nublar.

Theme parks
Psittacosaurus can be seen at 'Jurassic Park: The Ride' and is located in Ultrasaurus lagoon.

Jurassic Park III: Park Builder
Psittacosaurus was featured in the Gameboy Advance game Jurassic Park 3: Park Builder.

The Lost World: Jurassic Park Sounds of the Psittacosaurus can be heard in ambience of some forest areas on Isla Sorna.

Vocalizations
Since not appearing in any of the films, but rides and games, Psittacosaurus is only known from its laughing-like hoots. The hooting sound of the Psittacosaurus is made from the hooting sounds of the White-bellied green pigeon, a bird native to Asia much the dinosaur itself.

Links

 * InGen's website article