Affiliation: | University of Aberdeen, Department of Zoology, Lighthouse Field Station, Cromarty, Ross-Shire, United Kingdom E-mail:;NERC Sea Mammal Research Unit, Gatty Marine Laboratory, University of St. Andrews, St Andrews, KY16 8LB, Scotland, United Kingdom;University of Aberdeen, Department of Zoology, Lighthouse Field Station, Cromarty, Ross-Shire, United Kingdom |