Catharacta skua, Taxa Only, Exact Match: 2 Treatments

Catharacta skua			Mourer-Chauviré, Cécile & Geraads, Denis, 2010, The Upper Pliocene Avifauna of Ahl al Oughlam, Morocco. Systematics and Biogeography, Records of the Australian Museum 62 (1), pp. 157-184 : 174	174
Catharacta skua subsp. hamiltoni			Johannessen, Lars Erik & Lifjeld, Jan T., 2022, Type specimens of birds in the Natural History Museum, University of Oslo, Norway, Zootaxa 5150 (4), pp. 451-486 : 460-462	460-462