Assertion: dinosaur's ancestor | /r/HasProperty | small bipedal archosaurs
Facets:
Source sentences:
text: Dinosaurs were primitively bipedal: their probable ancestors were small bipedal Archosaurs.
text: This prehistoric horse was first described by the famous 19th century paleontologist Richard Owen, who mistook it for an ancestor of the hyrax, a small hoofed mammal
text: Dinosaurs were primitively bipedal: their probable ancestors were small bipedal Archosaurs.