Most DDT use was banned in , but it was so pervasive that the number of bald eagles continued to drop. 연방 멸종 위기종 법이 통과된 , 미국의 상징인 대머리 독수리는 멸종 위기종 목록에서 1위를 차지했습니다. Between and , no eaglets lived long enough to fly from their nests in Kentucky.