The weekly seminar of the Department of Neurophysiology will take place on March 26th at 3 PM in the Neurobiology Center Halll on the first floor of the Nencki Institute. prof. Hans-Peter Lipp (Institute of Anatomy, University of Zurich, Switzerland; School of Laboratory Medicine, Kwazulu-Natal University Durban, South Africa) will present a lecture entitled: “Comparing gravity vectors: experimental evidence for a bird GPS system for homing and migration”