1 Department of Cognitive Science, Lund University, Helgonavägen 3, Lund 22100, Sweden ivo.jacobs@lucs.lu.se.
2 Department of Behavioural Ecology and Evolutionary Genetics, Max Planck Institute for Ornithology, Eberhard-Gwinner-Straße, Seewiesen 82319, Germany Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK.
3 Centre for Behavior and Evolution, Institute of Neuroscience, Newcastle University, Framlington Place, Newcastle NE2 4HH, UK.
4 Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK Department of Experimental Psychology, University of Oxford, South Parks Road, Oxford OX1 3UD, UK.
5 Department of Cognitive Science, Lund University, Helgonavägen 3, Lund 22100, Sweden.