Authors
Richard Zink
Austrian Ornithological Centre, Konrad Lorenz Institute of Ethology, University of Veterinary Medicine, Austria
Johannes A. Hohenegger
Austrian Ornithological Centre, Konrad Lorenz Institute of Ethology, University of Veterinary Medicine, Austria
Austria
Hans-Martin Berg
Natural History Museum Vienna/Ornithology, Austria
Elena Kmetova-Biro
Austrian Ornithological Centre, Konrad Lorenz Institute of Ethology, University of Veterinary Medicine, Austria