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.
♦ ²Diet and distribution of elephant in the Maputo Elephant Reserve, Mozambique, Willem F. De Boer, Cornelio P. Ntumi, Augusto U. Correia and Jorge M. Mafuca, Afr. J. Ecol., 38, 188-201 (2000)