Groundbreaking Discovery: Fossilized Bones Reveal Air Sacs in Alvarezsaurians – A Key Feature for Modern Bird Flight

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Article title: First unambiguous record of pneumaticity in the axial skeleton of alvarezsaurians (Theropoda: Coelurosauria)

Author countries: Argentina, China

Funding: We thank P. Chafrat from Museo Patagónico de Ciencias Naturales, General Roca, Río Negro Province, Argentina. The authors gratefully acknowledge “Fundacion Patagonica de Ciencias Naturales” and “Sanatorio Juan XXIII” for making the CT images possible. MP was supported by the Faculty of Science of The Chinese University of Hong Kong. We thank Hans-Dieter Sues, an anonymous reviewer, and the editorial team of PLOS ONE for their comments which improved the quality of this manuscript.