How many types of warthogs are there?

There are two main species of warthogs: the common warthog (Phacochoerus africanus) and the desert warthog (Phacochoerus aethiopicus). The common warthog is found in various habitats across sub-Saharan Africa, while the desert warthog is adapted to arid environments. Both species are characterized by their distinctive tusks and facial warts, which are more prominent in males.