About the Authors

Gerald Grellet-Tinner
CONICET at CRILAR, Anillaco, Argentina

Gerald Grellet-Tinner
The Field Museum, Chicago, Illinois, United States of America

Gerald Grellet-Tinner
The Journey Museum, Rapid City, South Dakota, United States of America

Xabier Murelaga, Maitane Olivares, Luis A. Ortega, Ana Pascual
Departamento de Estratigrafía y Paleontología, Facultad de Ciencia y Tecnología, Euskal Herriko Unibertsitatea, Bilbao, Spain

Juan C. Larrasoaña
Instituto Geológico y Minero de España, Unidad de Zaragoza, Zaragoza, Spain

Luis F. Silveira
Seção de Aves, Museu de Zoologia da Universidade de São Paulo, São Paulo, Brazil

Patrick W. Trimby
Australian Centre for Microscopy and Microanalysis, The University of Sydney, Sydney, Australia

Corresponding Author

locarnolugano@gmail.com

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: GGT XM JL LS. Performed the experiments: MO LO PT AP GGT. Analyzed the data: MO LO PT AP GGT XM JL LS. Wrote the manuscript: GGT JL LS LO.