Since most of the atolls and reefs remain unexplored, there are still many hazards to be faced in visiting the islands.
島上鳥兒多由於島嶼孤懸海上，島上動物很少，最常見的是以魚類為主食的鰹鳥，綠嘴紅腳，身上是灰黑色的羽毛，所產的蛋，比雞蛋小一點，在島上到處都撿得到，是阿兵哥加菜的好材料，味道鮮美無比。