Author Affiliations +
Storrs L. Olson,* Robert E. Ricklefs
https://orcid.org/0000-0001-7649-8800**
*Division of Birds, Department of Vertebrate Zoology, National Museum of Natural History, P.O. Box 37012, Smithsonian Institution, Washington, D.C. 20013, USA (e-mail: olsons@si.edu); and
**Department of Biology, University of Missouri-St. Louis, 8001 Natural Bridge Road, St. Louis, Missouri 63121, USA (e-mail: ricklefs@umsl.edu).
