1. Resource Ecology Group; Wageningen University; PO Box 47; 6700 AA; Wageningen; The Netherlands
2. Animal Breeding and Genomics Centre; Wageningen University; De Elst 1; Wageningen; 6708 WD; The Netherlands
3. Biological Station Rybachy of the Zoological Institute RAS; 238535; Kaliningrad Region; Russia
4. Hunting Ornithology Section; State Information-Analytical Centre of Game Management and Environment; Ministry of Environment of Russia; Moscow; Russia