time of mounting the female lowers her head, while the male first bends and then straightens his forelegs and rests his head and neck on her back. The two remain together for one or two days, during which time the male ensures that no other male can approach the female. Gestation lasts for nearly eight months, after which generally a single calf is born. Parturition occurs throughout the year, though a peak may occur in the dry season. Calves are hidden adroitly, and brought out of cover only in the presence of many other sitatunga. The mother gazes and nods at the calf to summon it for nursing. A calf follows its mother about even after she has given birth to another calf. The mother suckles and licks her calf for about six months. The calf takes time to master the specialised gait of the sitatunga, and thus often loses its balance and falls in water. Males, and even some females, have been observed to leave their herds even before reaching sexual maturity due to intrasexual competition. Lifespan recorded in captivity averages 22 to 23 years. Habitat and distribution The sitatunga is an amphibious antelope (meaning it can live on both land and water) confined to swampy and marshy habitats. They occur in tall and dense vegetation of perennial as well as seasonal swamps, marshy clearings in forests, riparian thickets and mangrove swamps. Sitatunga move along clearly marked tracks in their swampy habitat, often leading to reed beds. These tracks, up to wide, can lead to feeding grounds and nearby riverine forests. The sitatunga hold small home ranges near water bodies In savannas, they are typically found in stands of papyrus and reeds (Phragmites species and Echinochloa pyramidalis). They share their habitat with the Nile lechwe in the Sudd swamps and with the southern lechwe in Angola, Botswana and Zambia. The sitatunga is native to Angola, Benin, Botswana, Burundi, Cameroon, Central African Republic, Chad, The Democratic Republic of the Congo, Equatorial Guinea, Gabon, Gambia, Ghana, Guinea, Guinea-Bissau, Kenya, Mozambique, Namibia, Nigeria, Rwanda, Senegal, South Sudan, Tanzania, Uganda, Zambia and Zimbabwe. It is extinct in Niger, where it formerly occurred in the Lake Chad region, and is feared to be extinct in Togo, where its habitat has been taken over by dense human settlements. While it is localised and sporadic in western Africa, the sitatunga is still common in the forests