There is one peculiar subfamily, Todinae, represented by only four species of Todus.
The subfamily is characterized by the narrow crowns of the molars, which are similar to those of sheep, and' the hairy muzzle.
Gazelles (Gazella), which form by far the largest genus of the subfamily, are inhabitants of open and frequently more or less desert districts.
A still more aberrant gazelle is a small North-East African species known as the beira (Dorcatragus melanotis), with very short horns, large hoofs and a general appearance recalling that of some of the members of the subfamily Neotraginae, although in other respects gazelle-like.
The duikers, or duikerboks (Cephalophus), of Africa, which range in size from a large hare to a fallow-deer, typify the subfamily Cephalophinae, characterized by the spike-like horns of the bucks, the elongated aperture of the face-glands, the naked muzzle, the relatively short tail, and the square-crowned upper molars; lateral hoofs being present.