Dennis C. Turner is Director of the Institute for Applied Ethology and Animal Psychology, Switzerland, a private faculty member of the University of Zurich (Vetsuisse Faculty) and Invited Professor at the Educational Research Center for Anthrozoology (ERCAZ), Azabu University, Japan. He has published extensively on domestic cats and is well known for his activities in international organizations concerning human-animal relationships, animal-assisted therapy and animal welfare. Patrick Bateson FRS is Emeritus Professor of Ethology at the University of Cambridge. He is President of the Zoological Society of London and former Vice-President of the Royal Society. He is also co-author of Play, Playfulness, Creativity and Innovation (Cambridge University Press, 2013), Plasticity, Robustness, Development and Evolution (Cambridge University Press, 2011) and Measuring Behaviour (Cambridge University Press, 3rd edition, 2007).