Byrkjedal, Ingvar, et al. “Trophic Ecology of Yellow-Billed Loons (Gavia Adamsii) and Common Loons (G. Immer) During the Non-Breeding Season”. Ornis Norvegica, vol. 49, Feb. 2026, pp. 1-12, doi:10.15845/on.v49.4573.