About the Authors
Department of Zoology, Southern Illinois University, Carbondale, Illinois, United States of America
Illinois Natural History Survey, Champaign, Illinois, United States of America
Zoo Atlanta, Atlanta, Georgia, United States of America
The authors have declared that no competing interests exist.
All four coauthors—KRL, JD, JRM, and MWS—participated in the conception and design of the research, data collection and analyses, and writing of the paper.