Silke Sachse1, Ivan Manzini2. 1. Department of Evolutionary Neuroethology, Max Planck Institute for Chemical Ecology, 07745, Jena, Germany. ssachse@ice.mpg.de. 2. Department of Animal Physiology and Molecular Biomedicine, Justus-Liebig-University Giessen, Giessen, Germany. Ivan.Manzini@physzool.bio.uni-giessen.de.