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Fountain, C. 1980. Three-horned rhinos. International Zoo News 27 (4): 17.

Three-horned rhinos

Note
Location World Subject Morphology Species Black Rhino (bicornis)

Daly (1937, Big game hunting and adventure) has a photo of black rhino shot in Tanaland showing the growth of a third horn. Also animal in Lisbon Zoo had third horn. Maybe this is a hereditary genetic defect as these animals came from the same region.

Related references
Bigalke, R.C.; Bateman, J.A. 1962. On the status and distribution of ungulate mammals in the Cape province, South Africa. Annals of the Cape Provincial Museums 2: 85-109.
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Holub, E. 1890. Von der Capstadt ins Land der Maschukulumbe. Reisen im südlichen Afrika in den Jahren 1883-1887, vol. 2. Wien, Alfred Holder.
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Pisani, Vittorio 1925. Atkin attacked by a rhinoceros in Kenya. Tribuna Illustrata 1925 Ocober 4: cover (illustration only).
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Lodge, A. 1994. Lewa Downs, Ngare Sergoi Wildlife Project Update. Proceedings of the 20th National Conference of the American Association of Zoo Keeper's Inc. Atlanta, Georgia, October 10-14 1993: 35-36, 1 table with wildlife counts.
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Starrenburg, J. 1705. Journal of an expedition into the interior of Africa, 16 October – 7 December 1705. In: Valentyn, 1726. Oud en Nieuw Oostindiën.
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Noordermeer, A. 1987. Dierentuinen van de wereld, 5: Oost-Duitsland. Vriendennieuws (Blijdorp, Rotterdam) 9 (4): 10-15.
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