Perhaps such ornaments were widespread in Caenagnathoidea and their relatives, and ultimately the oviraptorosaurian pygostyle evolved to help support them.
Quizais, eses adornos eran comúns entre os Caenagnathoidea e os seus parentes, e finalmente o pigostilo dos ovirraptorosaurios evolucionou para axudar a soster esas plumas.