Guillaume Chapron1, Adrian Treves2. 1. Grimsö Wildlife Research Station, Department of Ecology, Swedish University of Agricultural Sciences, 73091 Riddarhyttan, Sweden guillaume.chapron@slu.se. 2. Nelson Institute for Environmental Studies, University of Wisconsin, 30A Science Hall, 550 North Park Street, Madison, WI 53706, USA atreves@wisc.edu.