A commemorative lecture by Professor Robert Trivers, a Crafoord laureate, on occasion of Charles Darwin's 200th Birthday. Presented at the Fourth Thematic Conference of the German Ethological Society in Goettingen (Germany) on February 12, 2009. Including an introduction to Robert Trivers scientific achievements by Professor Peter Kappeler. Conference organizer: Peter Kappeler. Video producer: Marc Moises.