Attributes / relations provided by
♦ ¹del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
♦ ²Co-existence and niche segregation of three small bovid species in southern Mozambique, Herbert H.T. Prins, Willem F. de Boer, Herman van Oeveren, Augusto Correia, Jorge Mafuca and Han Olff, 2006 East African Wild Life Society, Afr. J. Ecol., 44, 186–198