Institute for Biodiversity Studies, Science and Research Centre, University of Primorska, Garibaldijeva 1, SI–6000 Koper, Slovenia / Department of Biodiversity, Faculty of Mathematics, Natural Sciences and Information Technologies, University of Primorska, Glagoljaška 8, SI–6000 Koper, Slovenia / Morigenos – Slovenian Marine Mammal Society, Kidričevo nabrežje 4, SI–6330 Piran, Slovenia