1. Galapagos Science Center, Universidad San Francisco de Quito, Isla San Cristóbal EC200150, Islas Galápagos, Ecuador
2. The Marine Mammal Center, 2000 Bunker Road, Sausalito, California 94965, USA
3. Department of Animal Behavior, Bielefeld University, Morgenbreede 45, Bielefeld 33501, Germany
4. Department of Infectious Diseases, and the Athens Veterinary Diagnostic Laboratory, University of Georgia, Tucker Hall, Athens, Georgia 30602, USA
5. Dirección de Ecosistemas, Dirección del Parque Nacional Galápagos, Isla Santa Cruz EC200350, Islas Galápagos, Ecuador