1 MARE-Marine and Environmental Sciences Centre & Faculdade de Ciências, Laboratório Marítimo da Guia, Universidade de Lisboa, Avenida Nossa Senhora do Cabo 939, Cascais, 2750-374, Portugal.
2 Department of Collective Behaviour, Max Planck Institute of Animal Behavior, c/o University of Konstanz, Universitätsstrasse 10, Konstanz, 78464, Germany.
3 Centre for the Advanced Study of Collective Behaviour, University of Konstanz, Konstanz, 78464, Germany.
4 Department of Biology, University of Konstanz, Universitätsstrasse 10, Konstanz, 78464, Germany.