1. Department of Special Education, University of Rostock, Germany
2. Konrad Lorenz Forschungsstelle Gruenau and University of Vienna, Department of Behavioural Biology, Austria
3. IEMT-Switzerland and Animal Behavior, University of Zurich-Irchel, Switzerland
4. School of Life Science, University of Skövde, Sweden and Department of Animal Environment and Health, Swedish University of Agriculture, Skara, Sweden