The male and female are so different in appearance that they seem like two different species. The male has chocolate colour fur with a white patch on the neck and the female is reddish brown in colour. Both sexes have horns, although those of the male are longer and more curved.
They are more active at dawn and dusk. They gather in herds of up to 50 females and one male or in small exclusively male flocks.
They are able to wade across shallow waters and swim in deep waters.