<P> Common warthog ivory is taken from the constantly growing canine teeth . The tusks, particularly the upper set, work in much the same way as elephant tusks with all designs scaled down . Tusks are carved predominantly for the tourist trade in east and southern Africa . </P> <P> The head of the common warthog is large, with a mane down the spine to the middle of the back . Sparse hair covers the body . Its color is usually black or brown . Tails are long and end with a tuft of hair . Common warthogs do not have subcutaneous fat and the coat is sparse, making them susceptible to extreme environmental temperatures . </P> <P> The common warthog is the only pig species that has adapted to grazing and savanna habitats . Its diet is omnivorous, composed of grasses, roots, berries and other fruits, bark, fungi, insects, eggs and carrion . The diet is seasonably variable, depending on availability of different food items . During the wet seasons, warthogs graze on short perennial grasses . During the dry seasons, they subsist on bulbs, rhizomes, and nutritious roots . Warthogs are powerful diggers, using both their snouts and feet . Whilst feeding, they often bend their front feet backwards and move around on the wrists . Calloused pads that protect the wrists during such movement form quite early in the development of the fetus . Although they can dig their own burrows, they commonly occupy abandoned burrows of aardvarks and other animals . The common warthog commonly reverses into burrows, with its head facing the opening and ready to burst out if necessary . Common warthogs will wallow in mud to cope with high temperatures and huddle together to cope with low temperatures . </P> <P> Although capable of fighting (males aggressively fight each other during mating season), the common warthog's primary defense is to flee by means of fast sprinting . The common warthog's main predators are humans, lions, leopards, cheetahs, crocodiles, wild dogs and hyenas . Birds of prey such as Verreaux's eagle owls and martial eagles sometimes prey on piglets . However, if a female common warthog has any piglets, she will defend them very aggressively . On occasion, common warthogs have been observed charging and even wounding large predators . Common warthogs have also been observed allowing banded mongooses and vervet monkeys to groom them to remove ticks . </P>

Is a warthog a herbivore carnivore or omnivore