Claudia Mettke-Hofmann, Michael Wink, Hans Winkler, and Bernd Leisler Max Planck Institute for Ornithology, Department of Biological Rhythms and Behaviour, Von-der-Strasse 7, 82346, Andechs and Institute of Behaviour, Free University of Berlin, Haderslebener Strasse 9, 12163 Berlin, Institute of Pharmacy and Molecular Biotechnology, University of Heidelberg, Im Neuenheimer Feld 364, 69120 Heide...
