The common warthog (Phacochoerus africanus) – related to the swine family of pigs, boars and hogs – have patches on their faces that look like warts, but are just thick growths of skin. These patches act as padding for when males fight during mating season. Its tusks are enlarged canine teeth that protrude upwards from its mouth. There are two pairs: the shorter, lower pair are worn to a razor-sharp edge by rubbing against the longer, upper pair whenever the mouth is opened and closed. Calloused pads on warthogs’ wrists help protect them while they graze on bended forelegs. It occurs in much of sub-saharan Africa.