They preyed upon herbivorous dinosaurs such as hadrosaurs, ceratopsians and ankylosaurs. They have been reported from ceratopsians, hadrosaurs and other tyrannosaurs. Fossils found on the island include hadrosaurs, plesiosaurs, and mosasaurs. The multiple clutches indicate some therizinosaurs were colonial nesters like hadrosaurs, prosauropods, titanosaurs, and birds. Pleurokinesis refers to the complex multiple jointing thought to occur in ornithopods, such as hadrosaurs. It contains abundant fossils of vertebrates, including dinosaurs such as the hadrosaurs. Another common group of North American dinosaurs were the hadrosaurs. The genus "Iguanodon" belongs to the larger group Iguanodontia, along with the duck-billed hadrosaurs. Osteochondrosis is also commonly found in hadrosaurs. Like other hadrosaurs, it was an herbivore. Like other hadrosaurs, they could have moved both bipedally and quadrupedally. In contrast with eggshell fossils, the remains of very young hadrosaurs are somewhat common. In contrast with eggshell fossils, the remains of very young hadrosaurs are actually somewhat common. It was an apex predator, preying upon abundant ceratopsids and hadrosaurs. Like other hadrosaurs, "Tsintaosaurus" probably lived in herds.