Assertion: wishbone | /r/AtLocation | primitive theropods
Facets:
Source sentences:
text: The bipedal posture, hinge-like ankle, hollowed bones, and long S-shaped neck of birds were inherited from deep dinosaurian ancestors [], the wishbone (furcula) and three-fingered hands of birds first appeared in primitive theropods, the reversion of the pubis and associated forward movement of the center of mass occurred in maniraptoran theropods, and the ability to fold the forearm against the body evolved in paravians closely related to birds [].