Tristram Wyatt is a researcher at the University of Oxford and an Emeritus Fellow of Kellogg College, Oxford. His book Pheromones and Animal Behavior (2nd edition, 2014, Cambridge University Press), won the Society of Biology’s 2014 prize for the Best Postgraduate Textbook. Department of Zoology, South Parks Road, Oxford OX1 3PS, UK. Website: www.zoo.ox.ac.uk/group/pheromones/ Email: tristram.wyatt@zoo.ox.ac.uk