Spragens KA, Bjerre ER, Black JM. Black Brant Branta bernicla nigricans grit acquisition at Humboldt Bay, California, USA. Wildfowl [Internet]. 2013 Dec. 19 [cited 2025 Dec. 16];:104-15. Available from: https://tidsskrift.dk/Wildfowl/article/view/153609