1. Southwest Fisheries Science Center, NOAA Fisheries; Marine Mammal and Turtle Division; 8901 La Jolla Shores Dr. La Jolla CA 92037 USA
2. Instituto Nacional de Ecologia y Cambio Climatico/SEMARNAT; Coordinacion de Investigacion y Conservacion de Mamiferos Marinos; CICESE Camper 10, Carretera Ensenada-Tijuana 3918, Zona Playitas Ensenada B.C. 22860 Mexico
3. Alaska Fisheries Science Center, NOAA Fisheries; Marine Mammal Laboratory; 7600 Sand Point Way N.E. Seattle WA 98115 USA
4. Chelonia Limited; The Barkhouse Mousehole TR19 6PH UK
5. University of St Andrews, Centre for Research into Ecological and Environmental Modelling; The Observatory; Buchanan Gardens, St Andrews KY16 9LZ Fife
6. University of St Andrews, Sea Mammal Research Unit; Scottish Oceans Institute; St Andrews KY16 8LB Fife