1. Department of Anthropology, University of Zurich, Zurich, Switzerland.
2. Behavioural Ecology Group, Wageningen University & Research, Wageningen, Netherlands.
3. State Key Laboratory of Biocontrol, Department of Ecology and School of Life Sciences, Sun Yat-sen University, Guangzhou, China.
4. Animal Ecology, Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden.
5. Department of Biology, University of Konstanz, Konstanz, Germany.
6. Center for the Advanced Study of Collective Behavior, University of Konstanz, Konstanz, Germany.