Skull of Muskox (Ovibos moschatus) in captivity at the Large Animal research Station, Fairbanks, Alaska, USA. Photographed on 16 August 2009.www.inaturalist.org/observations/53214765
Die Sugthiere in Abbildungen nach der Natur /.Erlangen :Expedition des Schreber'schen sugthier- und des Esper'schen Schmetterlingswerkes [etc.,1774]-1846..biodiversitylibrary.org/page/31078178