Horns seldom exceed 50 cm and may reach 65 cm in Nepal. Young males, called bucks are light brown in color and after 3 years their pelage turns quite black. Females called does are beige in color and hornless.
Black bucks are territorial, although they take occasional trips to surrounding terrain.
The territoriality exhibited by the species is the result of the dominance shown by the adult males. Females do not make any territory of their own. Their habitat is open grass land with thorny and dry deciduous forest. They prefer ectonal region between the forest and grass land. They prefer to be in group ranging 15 - 20 individuals.