RESEARCH ARTICLE Sex-specific effects of cooperative breeding and colonial nesting on prosociality in corvids Lisa Horn1*, Thomas Bugnyar1, Michael Griesser2,3,4, Marietta Hengl1,5, Ei-Ichi Izawa6, Tim Oortwijn2, Christiane Ro¨ ssler1, Clara Scheer1,7, Martina Schiestl8, Masaki Suyama9, Alex H Taylor10, Lisa-Claire Vanhooland1, Auguste MP von Bayern11, Yvonne Zu¨ rcher12, Jorg JM Massen1,13 1Department of Behavioral and Cognitive Biology, University of Vienna, Vienna, Austria; 2Department of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland; 3Department of Biology, University of Konstanz, Konstanz, Germany; 4Center for the Advanced Study of Collective Behaviour, University of Konstanz, Konstanz, Germany; 5Eulen- und Greifvogelstation Haringsee, Haringsee, Austria; 6Department of Psychology, Keio University, Tokyo, Japan; 7Faculty of Psychology, Education and Sports, University of Regensburg, Regensburg, Germany; 8Department of Linguistic and Cultural Evolution, Max Planck Institute for the Science of Human History, Jena, Germany; 9Department of Behavioral Sciences, Hokkaido University, Sapporo, Japan; 10School of Psychology, University of Auckland, Auckland, New Zealand; 11Max-Planck-Institute for Ornithology, Seewiesen, Germany; 12Department of Anthropology, University of Zurich, Zurich, Switzerland; 13Animal Ecology Group, Department of Biology, Utrecht University, Utrecht, Netherlands Abstract The investigation of prosocial behavior is of particular interest from an evolutionary *For correspondence: perspective. Comparisons of prosociality across non-human animal species have, however, so far
[email protected] largely focused on primates, and their interpretation is hampered by the diversity of paradigms and Competing interests: The procedures used. Here, we present the first systematic comparison of prosocial behavior across authors declare that no multiple species in a taxonomic group outside the primate order, namely the bird family Corvidae.