About the Authors
Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
Department of Integrative Biology, University of California Berkeley, Berkeley, California, United States of America
Department of Zoology and Animal Biology, University of Geneva, Geneva, Switzerland
Alaska Quaternary Center, University of Alaska Fairbanks, Fairbanks, Alaska, United States of America
The authors have declared that no competing interests exist.
NR and MH conceived and designed the experiments. NR performed the experiments. PM collected data. ASM, JLP, and MS analyzed the data. NR, ASM, MS, PM, and MH contributed to writing the paper.