Mosasaurs, plesiosaurs, pterosaurs and many species of plants and invertebrates also became extinct. This group also includes all extinct dinosaurs, pterosaurs, and extinct relatives of crocodilians. Avemetatarsalians are bird-line archosaurs, including pterosaurs and dinosaurs (the latter including birds). "Pteranodon" were pterosaurs, not dinosaurs. Archosauria includes crocodylians, birds, and extinct relatives such as aetosaurs, rauisuchids, pterosaurs, and non-avian dinosaurs. Archosaurs are ancestrally superprecocial as evidenced in various dinosaurs, pterosaurs, and crocodylomorphs. Two clades of avemetatarsalians, pterosaurs and birds, independently evolved flight. However, no other Early Cretaceous pterosaurs reached its size. Footprints indicate the presence of large ornithopods and pterosaurs as well. These two specimens represent the most complete remains of Cretaceous pterosaurs found in England. These deposits are famous for pterosaurs and the earliest bird, Archaeopteryx. This seems to underscore a higher diversity of terminal Cretaceous pterosaurs than previously thought. In contrast, Azhdarchoidea mostly were terrestrial pterosaurs. There are also models of birds, bats and pterosaurs (usually ornithopters). Tracks made by ctenochasmatoids indicate that these pterosaurs swam using their hindlimbs.