| The terms hypsilophodont and iguanodont are ambiguous when applied to pre-Cretaceous ornithopods. |
| The skull is an example of convergent evolution with some of the ornithopods and also with the dicynodonts, an herbivorous group of early synapsids. |
| Virtually all of the common major groups of theropods and ornithopods typical of the Late Cretaceous of northern North America are present. |
| The ornithopods, for example, depended on fleetness of foot and acute sight and hearing. |
| Such stomach stones or gastroliths have been reported from the gut regions or found nearby of prosauropods, sauropods and ornithopods. |
| Trackways have also confirmed parental behavior among ornithopods from the Isle of Skye in northwestern Scotland. |
