It is a very old tradition to use the bones of domesticated and wild animals is directly correlated to the cultural and ethical practices of the nomadic Mongolians. Bone crafts have been practiced since the time that the nomads used various parts of their animals, such as ribs, shins, radiuses, pelvises, kneecaps, ankles, nails, teeth, spines, skulls, and chins, as tools. Later, they started using tusks, canines, and horns, particularly those of strong animals, which had symbolic as well as decorative meaning. With the development of bone crafts, various types of bone games have appeared. Ankle bones, for example, are used for a variety of traditional games and toys.