About the Authors
Department of Zoology, Institute of Ecology and Earth Sciences, University of Tartu, Tartu, Estonia
Estonian Environment Information Centre, Tartu, Estonia
State Forest Research Institute “Silava”, Salaspils, Latvia
Wildlife Park Kadzidlowo, Ruciane Nida, Poland
AK is an employee of Wildlife Park Kadzidlowo who played a role in the data collection and analysis of the manuscript. This does not alter the authors’ adherence to all the PLOS ONE policies on sharing data and materials.
Conceived and designed the experiments: MH PM JO AK US. Performed the experiments: MH AK. Analyzed the data: MH PM JO AK US. Contributed reagents/materials/analysis tools: MH PM JO AK US. Wrote the paper: MH US.