Affiliation: | 1. Centre de Recherches sur la Cognition Animale, CNRS, Université Paul Sabatier, Toulouse, F-31062 Cedex 09, France;2. School of Life Sciences, University of Sussex, John Maynard Smith Building, Falmer, Brighton, Sussex BN1 9QG, UK;3. Department of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia |