Thus, the American prong-buck has a white patch behind and a black muzzle.

The Tartarian antelope, the Ovis poli of High Asia, the Java wild ox, several species of deer, and a large number of antelopes have a similar conspicuous white patch behind, which, in contrast to the dusky body, must enable them to be seen and followed from a distance by their fellows.

Where there are many species of nearly the same general size and form inhabiting the same region--as with the antelopes of Africa--we find many distinctive markings of a similar kind.

The gazelles have variously striped and banded faces, besides white patches behind and on the flanks, as shown in the woodcut.
The spring-bok has a white patch on the face and one on the sides, with a curiously distinctive white stripe above the tail, which is nearly concealed when the animal is at rest by a fold of skin but comes into full view when it is in motion, being thus quite analogous to the upturned white tail of the rabbit.

In the pallah the white rump-mark is bordered with black, and the peculiar shape of the horns distinguishes it when seen from the front.