1. Evolutionary Biology; Max Planck Institute for Ornithology; Seewiesen Germany
2. Department of Life Sciences; Imperial College London; Ascot UK
3. Department of Collective Behaviour; Max Planck Institute for Ornithology; Konstanz Germany
4. Chair of Biodiversity and Collective Behaviour; Department of Biology; University of Konstanz; Konstanz Germany
5. Department of Zoology; Edward Grey Institute of Field Ornithology; University of Oxford; Oxford UK