About the Authors
- Maris Hindrikson
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Affiliation Department of Zoology, Institute of Ecology and Earth Sciences, University of Tartu, Tartu, Estonia
- Peep Männil
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Affiliation Estonian Environment Information Centre, Tartu, Estonia
- Janis Ozolins
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Affiliation State Forest Research Institute “Silava”, Salaspils, Latvia
- Andrzej Krzywinski
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Affiliation Wildlife Park Kadzidlowo, Ruciane Nida, Poland
- Urmas Saarma
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* E-mail: Urmas.Saarma@ut.ee
Affiliation Department of Zoology, Institute of Ecology and Earth Sciences, University of Tartu, Tartu, Estonia
Competing Interests
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.
Author Contributions
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.