In Changtang Prairie, thenomadic natures of wild, unrulyand doughty are always inpeople's blood vessels. However, withthe intrusion of modern civilization,the wildness and unruliness mostlystay in elder people's memories.Every single wrinkle on the foreheadof a weather-beaten old man is arecord of an unforgettable history.Every old man would speak proudlyto his offspring about the tribe hebelongs, the history of its "bonefamily" and great achievements ofhis tribe leaders. The elders still takedelight in talking about the legendsof their bone family ancestors.