Figure 7: Approximate former and present known distribution of the desert warthog (Phacochoerus aethiopicus ssp.) and the common warthog (P. africanus ssp.). Modified after Ansell (1978), Cumming (1851), Dorst and Dandelot (1970), Haltenorth and Diller (1977), Hillman (1982), Howard and Marchant (1984), Grubb (this vol., Section 4.1), IUCN (1987, 1988), Joubert and Mostert (1975), Limoges (in press), du Plessis (1969), Roure (1968), Sayer and Green (1984), Schmidt (1988), Skead (1981), Smithers and Wilson (1979) and Yalden et al. (1984).