1. Department of Mathematics and Statistics, Washington State University, Vancouver, WA 98686, USA
2. School of Biological, Earth and Environmental Sciences, University College Cork, T23 N73K Cork, Ireland
3. Department of Evolutionary Biology, Ecology and Environmental Sciences, IRBio, Faculty of Biology, University of Barcelona, 08028 Barcelona, Spain
4. Asociación Tursiops, 07010 Palma de Mallorca, Balearic Islands, Spain
5. Sea Mammal Research Unit, School of Biology, University of St Andrews, KY16 8LB St Andrews, UK