Suni are around high at the shoulder and weigh . They are usually reddish brown, darker on their back than their sides and legs. The belly, chin, throat and insides of legs are white. The nostrils are prominent red, and there are black rings around the eyes and above the hooves. Males have horns long, that are ridged most of their length and curve backwards close to their heads. Females do not have horns. Suni can make weak barking and whistling sounds.