To better understand the evolutionary history of postcranial pneumaticity, studies have surveyed its distribution among non-avian dinosaurs.
Akinobu Watanabe, Maria Eugenia Leone Gold, Stephen L Brusatte, Roger B J Benson,Jonah Choiniere, Amy Davidson, Mark A Norell 2015, 'Vertebral Pneumaticity in the Ornithomimosaur Archaeornithomimus (Dinosauria: Theropoda)Revealed by Computed Tomography Imaging and Reappraisal of Axial Pneumaticity in Ornithomimosauria.',PLoS ONEhttp://europepmc.org/articles/PMC4684312?pdf=render. Retrieved from PLOS CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)