Omnivoropteryx
Omnivoropteryx (meaning "omnivorous wing") is a genus of primitive flying avialan from the early Cretaceous Upper Jiufotang Formation of China. The authors who described "Omnivoropteryx", Stephen Czerkas and Qiang Ji, stated that their specimen closely resembles "Sapeornis", but the pubis was longer and, since no skull was known for "Sapeornis", they did not consider the two names synonyms. The later discovery of "Sapeornis" skulls shows that they were indeed similar to "Omnivoropteryx". This may make "Omnivoropteryx" a junior synonym of "Sapeornis", and the name may be abandoned. Classification. Czerkas and Ji created the family Omnivoropterygidae to contain the genus  Omnivoropteryx, as well as the order Omnivoropterygiformes, though some scientists do not recognize taxa that contain only one genus. Paul Sereno, for example, considered the family Omnivoropterygidae to be invalid because it is redundant and was not given a phylogenetic definition. The single species "O. sinousaorum" shows an interesting mix of specialized and generalized characters: the legs were short and well suited for perching on branches, while the wings were long, suggesting it did not need a running or jumping takeoff to get into the air. Its skull, on the other hand, was similar to some early oviraptorosaurs, having the  structure of a beak designed for crushing and tearing with some teeth at the tip of the upper jaw. Thus, the species may have been an opportunistic omnivore (as the name suggests), utilizing a wide range of food sources, unlike other early birds which were active predators of smaller animals.