1. Institute of Biological and Environmental Sciences; University of Aberdeen; Aberdeen AB24 2TZ UK
2. Centre for Integrative Ecology, School of Life and Environmental Sciences; Deakin University; Warrnambool Victoria 3280 Australia
3. Murdoch University Cetacean Research Unit, School of Veterinary and Life Sciences; Murdoch University; Murdoch WA 6150 Australia
4. School of Engineering and Natural Sciences; University of Iceland; Sturlugata 7 101 Reykjavik Iceland
5. Húsavik Research Center; University of Iceland; Hafnarstett 3 640 Húsavik Iceland
6. Marine Alliance for Science and Technology for Scotland; University of Aberdeen; Aberdeen AB24 2TZ UK