About the Authors

Carole C. Baldwin

baldwinc@si.edu

Affiliation Department of Vertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington D. C., United States of America

G. David Johnson

Affiliation Department of Vertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington D. C., United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: CCB GDJ. Performed the experiments: CCB GDJ. Analyzed the data: CCB GDJ. Contributed reagents/materials/analysis tools: CCB GDJ. Wrote the paper: CCB GDJ.