Acknowledgements
We thank all the volunteers involved in marmot catching. We thank O. Vedder and S. Bouwhuis for their helpful comments and F. Kirkpatrick Baird for editing this manuscript. We also warmly thank M. Moiron for her advices regarding statistical analyses. The ANR-13-JSV7-0005 supported this work. The protocol was conducted under the permit AP n82010/121 and approved by the national ethical committee (n8BH2012-92 V1). The last author is authorised for animal experimentation (n8R45GRETAF110). The authors declare to have no conflict of interest.
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