Topi Antelope Facts: Images of Topi (Damaliscus korrigum) one of the fastest Antelope, which can reach speeds of 50mph. They are highly social and yet can spend many hours, solitarily overlooking the plains of Kenya, as 'look-out' for other animals, against mutual predators. The Topi looks very much like a Hartebeest. Prominently ringed horns are present in both sexes. During the rutting season, bulls establish territories, across which nursery herds of 15-30 females move freely, with dominant bulls attempting to keep receptive females within their territories, for mating. Outside the rut, bulls move freely across the plains. A single calf is born, close to the onset of the rainy season, weighing up to 12kg, after a gestation period of 240 days. It will walk within a very short time after birth, to keep up with the herd. Topi have a lifespan of up to 9 years in the wild Topi eat short to medium length, new-growth grasses.