In connection with the mass extinction of the herbivorous hoofed mammals in the late Holocene and early Neocene their place in the Holocene ecosystems occupied descendants of representatives of other groups. In the New World it is the descendants of South American rodents, and in the Old World - lagomorphs. In Eurasia and Africa have formed a number of species of lagomorphs, convergent similar to antelope, deer, and even the bulls. This type - analogue mountain goats, a close relative of the Himalayan snowlopper . It runs fast mammal the size of a goat, but with longer legs.
Dwelling in a dry and hot climate has left its mark on the appearance of the beast: it has shorter hair than his Asiatic cousin. In addition, stone wool horse does not change color in the winter, keeping the rusty-brown color. In animal nose has a longitudinal coffee-brown stripe, fork forks on the forehead. Eyes Stonelopper shifted to the top of the head, allowing the grazing animals to see far around them. They circled the ring yellowish-white wool. Abdomen gray, and the inner part of the buttocks and bottom of the tail are bright white in color. It is used for alarm: Zadran opens on the back tail section of white wool, highly visible from afar.
Ears of the stonelopper is wider and longer than the Himalayan species: they pass a dense network of blood vessels, enhancing heat transfer. This species is also no characteristic "whiskers", but at the withers males grow a mane of long blond hair, is used to establish dominance relationships.
Hind legs slightly longer than the front of the beast: it facilitates grazing on the slopes. It digitigrade animal; claws directed downward, forming a reliable support when climbing the steep mountain slopes. Head stone horse is quite long and narrow, and his eyes shifted upwards, allowing to survey the neighborhood freely when feeding.
Animals are kept in groups of 10 - 20 animals in the family which are formed of one male and 3 - 5 females and living immature single blank and animals.
mating season - mid-summer. In the spring the female gives birth to two cubs sighted developed coated monochromatic beige wool. At one year old female is ready to mate. The male matures at the same age, but he has a real chance to leave offspring until the age of 3 - 8 years, until there are young strong competitors. Lifetime does not exceed 12 - 13 years.