The Tsessebe does resemble the Red Hartebeest but it is smaller and darker. The Red Hartebeest has heart-shaped horns and a much longer face and forehead. The Tsessebe is a large antelope, with a shoulder height of some 1.2 m. They measure between 150 to 230 cm in length; with males being slightly larger than females. Both sexes grow horns, which are between 30 and 40 cm long. The Tsessebe are among the fastest antelopes in Africa and can run at speeds up to 90 km/h.