 The oribi is a small , slender antelope ; it reaches nearly 50 – 67 centimetres ( 20 – 26 in ) at the shoulder and weighs 12 – 22 kilograms ( 26 – 49 lb ) . The head @-@ and @-@ body length is typically between 92 and 110 centimetres ( 36 and 43 in ) . <unk> dimorphic , males are slightly smaller than females ( except for O. o. ourebi , in which females are smaller ) . This antelope features a slightly raised back , and long neck and limbs . The glossy , yellowish to rufous brown coat contrasts with the white chin , throat , underparts and rump . The bushy tail , brown to black on the outside , has white <unk> ( except in O. o. hastata , that has a completely black tail ) . The subspecies show some variation in colouration ; O. o. ourebi is a rich rufous , while O. o. hastata is <unk> . 
