Eagles worldwide, like all large raptors, are threatened by a variety of forces that limit their ability to breed and survive. The majority of these are linked to problems caused by human overpopulation and resource consumption. All four of the eagle species we study in Kazakhstan appear on national or international "Red Lists" of threatened and endangered species. Their breeding is threatened by a number of factors, including habitat loss, persecution, and threats to their prey base. On migration and during winter, survival is threatened primarily by habitat loss and by shooting, although environmental poisons may also influence these birds.