The headlights of a slow moving car washed her white body, shadowing the curve of her buttocks, the roundness of her shoulder, painting her golden hair in its light.
One of the distinctive features of this family is the presence of small naked callosities on the buttocks; another being a difference in the number of vertebrae and ribs as compared with those of the Simiidae.
Lyrate or sub-lyrate horns in both sexes, and by the white of the buttocks not extending on to the haunches.
In colour the sides of the face are puce, and the neck and most of the body purplish, but the buttocks and upper part of both fore and hind limbs are transversely barred with black and white, while their lower portion is mainly white with black fetlock-rings, and in the front pair a vertical black stripe on the anterior surface.
A large space around the greatly developed callosities on the buttocks, as well as the upper part of the insides of the thighs, is naked and of a crimson colour, shading off on the sides to lilac or blue, which, depending upon injection of the superficial blood-vessels, varies in intensity according to the condition of the animal - increasing under excitement, fading during sickness, and disappearing after death.
WATERBUCK (Wasserbok), the name of a large South African antelope (Cobus ellipsiprymnus) belonging to the subfamily Cervicaprinae, characterized by the white elliptical ring on the buttocks, and the general reddish grey colour of the long and coarse hair.
The name is extended to include the sing-sing or defassa waterbuck (C. def assa), a wides p read species, without the white ring on the buttocks, and represented by several local races, one of which is foxy red while a second is greyish.
The most distinctive feature of the deer of this group is, however, the patch of long erectile white hairs on the buttocks, which, although inconspicuous when the animals are quiescent, is expanded into a large chrysanthemum-like bunch when they start to run or are otherwise excited.
Reddish in summer and greyish in winter, with a long tail, which is coloured like the back above but white below, and is carried elevated when the animal is running, so as to form with the white of the inner sides of the buttocks a conspicuous "blaze."