The Warthog is a long-legged, level-backed, un-patterned gray hog, with a broad face and white cheek whiskers. Both sexes have curved upper tusks, but are much heavier and longer in males. Warthogs live in moist and arid savannas and floodplains - they are absent only in rain forests and elevations above 10,000 ft. The diurnal Warthog uses its sensitive lips to harvest high-protein seeds from the ends of grass stems, and its nose disk is perfectly designed to unearth nutritious culms and rhizomes of grasses. Alarmed Warthogs trot rapidly with their tails held straight up.