DUIKER or DUIKERBOK, a small south African antelope, Cephalophus grimmi; the popular name alluding to its habit of diving into and threading its way through thick bush. The genus Cephalophus, together with two other African genera, Guavei and Sylvicapra, constitutes the sub-family Cephalophinae. Duikers are animals of small or medium size, frequenting thick forest. The horns, usually present in both sexes, are small and straight, situated far back on the forehead ; and between them rises a crest-like tuft of hair. The common duiker (C. grimmi) is found in bush-country from the Cape to the Zambezi, Nyasaland and Angola. The banded duiker (C. doriae) from West Africa is golden brown with black transverse bands on back and loins. C. sylvicultor, of West Africa, is the largest species, and ap proaches a donkey in size. (See ANTELOPE.)