 Female and young males, till their second winter, are yellowish-brown varying to reddish-grey with a darker brown mid-dorsal line extending from between the shoulders to the base of the tail.Mature males are spectacularly beautiful, with long sweeping scimitar shaped horns over 102 cm (40 in) in length and almost silver white bodies offset by a sooty grey chest, throat and face.The extent of white hairs in the hind neck and body region of males increases with age.