Warthogs are even-toed ungulates in the pig family (Suidae). They have adapted to temperature extremes by sheltering in large underground burrows which are sometimes insulated with grass. The "warts" (technically known as callosites) consist of three paired masses of thickened skin and connective tissue protecting the jaws, eyes, and muzzle. The males compete by tusk-wrestling and head banging. It is believed that these enlarged callosites are an adaptation to protect the head from injury much in the way that pads protect players of American football. In addition to the tusks, the enlarged rear molar is visible here. This is an adaptation for digging up grass roots.
The long bristles (setae) in this photo remind me of a line in Becket's play, "Happy Days" in which Winnie tries to read the small print on her toothbrush handle. After much difficulty, she deciphers the words "Genuine pure hog setae." It pleases her that, if one makes an effort, it's possible to learn something new every day.
Warthogs from Kenya and Tanzania are the race P. a. massaicus.
Nikon P510 Coolpix Point-and-shoot