Black Wildebeest have a dark brown to black body, an erect mane and a long whitish tail. Both sexes have heavy, forward curving horns. Bulls measure 1.2 metres at the shoulder and weigh 161 Kg. Cows measure 1.16 metres at the shoulder and weigh 130 Kg. The horns of calves are initially straight, and start to grow the characteristic curvature at approximately nine months of age.