In 2011, Dinosauromorpha was redefined by Sterling Nesbitt to be a branch-based clade, defined by including reptiles closer to one group than to another. Under this definition, Dinosauromorpha included all reptiles closer to dinosaurs (represented by "Passer domesticus", the house sparrow), rather than pterosaurs (represented by "Pterodactylus"), ornithosuchids (represented by "Ornithosuchus"), or other pseudosuchians (represented by "Crocodylus niloticus", the Nile crocodile). Nesbitt's study supported the hypothesis that Pterosauromorpha (pterosaurs and their potential relatives) was the sister group of Dinosauromorpha. Pterosauromorphs and dinosauromorphs together formed the group Ornithodira, which encompasses almost all avemetatarsalians.