In higherrainfall equatorial regions, breeding is not limited to particular months. Both sexes fertile at 18 to 19 months, but few males breed before turning 4. Except for brief excursions or to change dens, piglets remain in burrow 6 to 7 weeks, after which they accompany their mother everywhere, filing behind her in a fixed order. Up to V2 offspring succumb to predators and other causes the first year. Although burrows keep warthogs safe at night, emerging in the morning can be risky since lions are clever enough to sniff out occupied burrows and patient enough to wait in ambush at breakfast time.
Warts absorb blows, protect eyes.
Sociable Behavior Lying in contact. Especially in burrows and outside when it is cold. Rubbing preorbital and tusk glands together or on partner's face and body. Often follows greeting. Adopting mating stance.