Shantungosaurus

Shantungosaurus giganteus is a species of hadrosaurid dinosaur from the Late Cretaceous of what is now Shandong Province, China. The genus name derives from Shantung (an old spelling of Shandong) and the Greek for lizard, while giganteus signals its large size. It is one of the largest known hadrosaurs and among the largest duck-billed dinosaurs.

Fossils of Shantungosaurus have been found in the Zhucheng area of Shandong, in rocks dating to the Late Cretaceous. The remains include substantial skull and postcranial material, and multiple individuals have been recovered from extensive bone beds associated with the same formation. The discoveries contributed to the view that hadrosaurs could reach large sizes and lived in large, living communities in some regions.

In terms of anatomy, Shantungosaurus was a large, horned, herbivorous hadrosaurid. It possessed a broad, duck-billed snout and a dental battery with numerous closely packed teeth adapted for grinding tough vegetation. Estimates for the animal's size place its length around 12 to 15 meters (40 to 50 feet) and body mass in the vicinity of 15 to 16 tonnes, making it one of the largest hadrosaurs known.

Ecologically, shantungosaurids would have inhabited floodplains and coastal plain environments, probably feeding on abundant low-lying vegetation. Like other hadrosaurs, it is generally interpreted as a facultatively bipedal and quadrupedal herbivore, capable of moving on all fours for feeding and on two legs for travel.

Taxonomically, Shantungosaurus is placed within Hadrosauridae. Its precise relationships within the family have varied with successive analyses, but it is widely recognized as a large and distinctive hadrosaurid from the Late Cretaceous of China.