Asian ornithomimid rhamphothecae from North American ones, based on maxillary vascular foramina found in the latter. The following cladogram follows that of Xu and colleagues in 2011: Paleobiology The herbivory of this genus is supported by the rare presence of gastroliths, as such stones were found forming conspicuous masses in the stomach areas of the fossil skeletons. This species was gregarious, which is corroborated by the arrangement of the fossil remains in a small bonebed with the juvenile individuals being approximately of the same age. This is furthermore supported by the increase of running ability as the animal progressed in its ontogeny, thus shown in the more cursorial proportions of the adults which possess relatively longer lower legs. It was assumed by the describers that adults protected themselves and their juveniles from predators by forming familial groups; in 2008 however a study concluded that the all juvenile herds suggest that immature individuals were left to fend for themselves in juvenile groups while adults preoccupied themselves with nesting or brooding. See also Timeline of ornithomimosaur research References Ornithomimids Late Cretaceous dinosaurs of Asia Fossil taxa described in 2003 Taxa named by Lü Junchang