The topi,[1][2][3] sassaby,[4] tiang or tsessebe[3] (Damaliscus lunatus) is a large African antelope of the genus Damaliscus and subfamily Alcelaphinae in the family Bovidae, with a number of recognised geographic subspecies.[5] Some authorities have split the different populations of the species into different species,[6][7] although this is seen as controversial.[8][9][10] The common tsessebe or sassaby (Damaliscus lunatus lunatus) is the southern, nominate form of these subspecies, although some authorities have recognised it as an independent species. It is most closely related to the Bangweulu tsessebe, sometimes also seen as a separate species,[6][7] less to the topi, korrigum, coastal topi and tiang subspecies of D. lunatus,[7] and less to the bontebok in the same genus.[6] Common tsessebe are found in Angola, Zambia, Namibia, Botswana, Zimbabwe, Eswatini (formerly Swaziland), and South Africa.[6][11] Common tsessebe are one of the fastest antelopes in Africa[12] and can run at speeds up to 90 km/h.[13]