Duikers are animals of small or medium size, usually frequenting thick forest.
(See ANTELOPE, CHAMOIS, GORAL, ROCKY MOUNTAIN GOAT, SEROW and TAKIN.) Under the indefinable term "antelope" (q.v.) may be included the seven remaining sections, namely Tragelaphinae (kudu and eland), Hippotraginae (sable antelope and oryx), Antilopinae (black-buck, gazelles, &c.), Cervicaprinae (reedbuck and waterbuck), Neotraginae (klipspringer and steinbok), Cephalophinae (duikers and four-horned antelopes) and Bubalinae (hartebeests and gnus).
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.
In the duikers themselves the single pair of horns is set in the midst of a tuft of long hairs, and the face-gland opens in a long naked line on the side of the face above the muzzle.