ACKNOWLEDGEMENTS
We thank Gary Nunn, Jeremy J. Austin, Chris Gaskin, Juan E.
Martínez-Gómez, and Maite Louzao for collecting tissue and blood samples
from the field and/or providing tissue samples from museum skins for
this study. We would also like to thank the many institutions that
provided tissue loans for this research: Smithsonian National Museum of
Natural History, Louisiana State University Museum of Natural Science,
University of Washington Burke Museum, American Museum of Natural
History, the University of Kansas Biodiversity Institute, and the Muséum
National d’Histoire Naturelle. We thank the pertinent authorities for
issuing the permits needed for this work. Finally, we would like to
thank Josephine R. Paris for her comments on an early version of this
manuscript and Martí Franch for his wonderful shearwater illustrations.
Research funding was provided by the Fundación BBVA (program “Ayudas a
Equipos de Investigación Científica 2017”, project code 062_17 to
M.R.).