Rhynchoraptor ancestry can be traced to small, basal euornithopods of the same stock that produced the euclasaurs and viriosaurs. Many small, normally herbivorous ornithopods even today will often take insects and smaller vertebrate animals and in the Late Paleocene, one family became increasingly adapted for omnivory. The poorly understood Eocene-Oligocene Extinction Event cleared out Australia's top predators (abelisaurids and deinonychosaurs). In the ensuing ecological vacuum, two dinosaurian lineages - the early rhynchoraptors, the ancestors of the cedunasaurs, and flightless pterosaurs all competed for supremacy in the large predator guilds. Despite the cedunasaurs producing some terrifying monsters, the most noteable being the massive Pikodon maximus, they were unable to compete with