Protoavis texensis is regarded as an died out species that could be the earliest fossil of a bird, pushing back avian origins into the Late Triassic. Protoavis dinosaur - Dinosaurs - Dinosaur, facts, paleontology. Protoavis Facts - information about the extinct, prehistoric. Protoavis - Fossil Wiki, the paleontology wiki Description Edit. Protoavis: Facts, Discussion Forum, and Encyclopedia Article Protoavis (meaning "first bird") is a problematic. Among other things it mentioned the arangement. This carnivores' fossils were discovered just outside of Post, Texas, US. Related Information & Resources See Also Archaeopteryx; Prehistoric Animals - Prehistoric and Extinct Animals Protoavis | Define Protoavis at Dictionary.com noun a fossil bird of the genus Protoavis, from the Triassic Period, having a birdlike, partly toothless jaw structure, a tail and hind legs resembling those of. Protoavis is usually depicted as being a bipedal archosaur, similar to several poposaurs and rauisuchids that may have been partially or habitually bipedal and. The Protoavis name means first bird