K. W. Wolter, L. G. Underhill, M. López Gómez, and M. Brooks, “Bird distribution dynamics 6 - Cape Vulture <i>Gyps coprotheres</i> in South Africa, Lesotho and Swaziland”, Biodiv. Obs., vol. 8, pp. 4: 1 – 11, Jan. 2017.