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Al Vrezec
National Institute of Biology, Večna pot 111, SI–1000 Ljubljana, Slovenia
Guy Duke
Oxford University Centre for the Environment, South Parks Road, Oxford, OX1 3QY, United Kingdom
András Kovács
Koszoru u. 46, H–3300 Eger, Hungary
Pertti Saurola
Finnish Museum of Natural History, P.O. Box 17, FI–00014 University of Helsinki, Finland
Chris Wernham
British Trust for Ornithology (Scotland), School of Natural Sciences, University of Stirling, Stirling, FK9 4LA, Scotland