The relict gull Ordos subpopulation, the biggest breeding population of relict gulls in the world, took at least 60 percentage of the insurance quantity of the whole available colonies in the world.

• 摘要鄂尔多斯繁殖群作为自然界中的全球遗鸥的最大种群，其对遗鸥有效种群（全部繁殖个体的总量）的保有量应占全球总量的60%25以上。