About the Authors

Brianna N. Gaskill

brianna.gaskill@crl.com

Affiliations Department of Animal Science, Purdue University, West Lafayette, Indiana, United States of America, Charles River Laboratories, Wilmington, Massachusetts, United States of America

Christopher J. Gordon

Affiliation Environmental Protection Agency, Research Triangle Park, North Carolina, United States of America

Edmond A. Pajor

Affiliation Department of Production Animal Health, University of Calgary, Calgary, Alberta, Canada

Jeffrey R. Lucas

Affiliation Department of Biological Sciences, Purdue University, West Lafayette, Indiana, United States of America

Jerry K. Davis

Affiliation Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana, United States of America

Joseph P. Garner

Affiliation Department of Comparative Medicine and the Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, California, United States of America

Competing Interests

All nesting material used in this experiment were donated by FiberCore, an environmental enrichment company. All mice were also donated by Charles River Laboratories. BNG at the time of conducting, analyzing, and writing this manuscript was a student at Purdue University. Upon graduation (Aug. 2011) she was hired as a postdoctoral researcher at Charles River. Charles River had no input on the interpretation of the results. All authors had full control of all primary data and its interpretation. These competing interests do not alter the authors’ adherence to all PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: BNG CJG EAP JRL JKD JPG. Performed the experiments: BNG. Analyzed the data: BNG JPG. Contributed reagents/materials/analysis tools: JPG. Wrote the paper: BNG.