About Potamochoerus porcus (Linnaeus, 1758)
The red river hog, Potamochoerus porcus, has striking orange to reddish-brown fur, with black legs and a tufted white stripe running along its spine. Adult red river hogs have white markings around the eyes, cheeks, and jaws, while the rest of the muzzle and face is contrasting black. The fur on the jaw and flanks is longer than the fur on the body, and males have especially prominent facial whiskers. Unlike other pig species native to tropical Africa, the entire body of the red river hog is covered in hair, with no bare skin visible. Adult red river hogs weigh 45 to 115 kg (99 to 254 lb), stand 55 to 80 cm (22 to 31 in) tall, and measure 100 to 145 cm (39 to 57 in) in total length. Their thin tail is 30 to 45 cm (12 to 18 in) long and ends in a tuft of black hair. Their ears are also long and thin, ending in tufts of white or black hair that can reach 12 cm (4.7 in) in length. Male boars are somewhat larger than female sows, and have distinct conical protuberances on either side of the snout along with small, sharp tusks. These facial protuberances are bony and likely protect the boar's facial tendons during head-to-head combat with other males. Red river hogs have a dental formula of 3.1.3–4.3/3.1.3–4.3, which is similar to that of wild boar. Individuals of both sexes have scent glands close to the eyes and on the feet; males have additional scent glands near the tusks on the upper jaw and on the penis. There is also a distinctive glandular structure about 2 cm (0.79 in) in diameter on the chin, which likely has a tactile function. Females have six teats. Red river hogs live in rainforests, wet dense savannas, forested valleys, and areas near rivers, lakes and marshes. Their distribution ranges from the Congo area and Gambia to eastern Congo, extending south to the Kasai and the Congo River. The exact boundary between the range of the red river hog and the closely related bushpig is unclear; in broad terms, red river hogs occupy western and central Africa, while bushpigs occupy eastern and southern Africa. Where the two species meet, they are sometimes reported to interbreed, though other authorities dispute this claim. While many subspecies were identified in the past, none are currently recognized. Red river hogs breed seasonally, so their young are born between the end of the dry season in February and the middle of the rainy season in July. The oestrus cycle of females lasts 34 to 37 days. Before mating, the male licks the female's genital region, and mating itself lasts approximately five to ten minutes. Gestation lasts 120 days. The mother builds a nest from dead leaves and dry grass before giving birth to a litter of up to six piglets, with three to four being the most common litter size. Newborn piglets weigh 650 to 900 g (23 to 32 oz), and are initially dark brown with yellowish stripes and spots. Piglets are weaned after about four months, and develop the plain reddish adult coat by around six months of age; the dark facial markings do not appear until they reach adulthood at about two years of age. Red river hogs probably live for around fifteen years in the wild.
