1. Biological and Experimental Psychology, School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London, UK
2. Institute of Behavioural Physiology, Leibniz Institute for Farm Animal Biology, Dummerstorf, Germany
3. Institute of Agricultural Sciences, ETH Zürich, Universitätstrasse 2, Zürich, Switzerland
4. Department of Life Sciences, University of Roehampton, London, UK