Sources:

-Animal Diversity Web - http://animaldiversity.org
-Encyclopedia of Life - http://eol.org/pages/7685/overview
-Horns Tusks and Flippers: The Evolution of Hoofed Mammals, Donald R. Prothero and Robert M. Schoch, 2002
-Large Herbivore Network - http://www.lhnet.org
-Ultimate Ungulate - http://www.ultimateungulate.com
-Wikipedia - http://en.wikipedia.org/wiki/Alcelaphinae

Citation: García, A.I. 2015. The Tree Of Nature (Online) at http://thetreeofnature.com

Some rights reserved. This work is licensed under a Creative Commons Atribution-NonCommercial-Share Alike 3.0 License.

You can watch more of Álvaro García´s artistic work at http://viuh.deviantart.com