Congratulations for the new look of your very interesting website! However, the info about desert warthog is not accurate; I would suggest that you refer to the following recent publications:
d’Huart, J.P. & Grubb, P. (2001): Distribution of the common warthog (Phacochoerus africanus) and the desert warthog (Phacochoerus aethiopicus) in the Horn of Africa. African Journal of Ecology 39: 156-169.
Randi, E., d’Huart, J.P., Lucchini, V. & Aman, R. (2002): Evidence of two genetically deeply divergent species of warthog Phacochoerus africanus and P. aethiopicus (Artiodactyla: Suiformes) in East Africa. Mammalian Biology (Z. Säugetierk.).67(2): 91-96.
d’Huart, J.P. & Grubb, P. (2005): A photographic guide to the differences between the Common Warthog (Phacochoerus africanus) and the Desert Warthog (Ph. aethiopicus). Suiform Soundings 5(2): 5-9.