At one time, these historic structures numbered six, now there are three. They were made by pouring a concrete floor, erecting an Armco Quonset hut atop the concrete, and covering the structure with sand. Through a Save American Treasures grant, the Fish and Wildlife Service was able to restore the front entrance panels on one of the huts.
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During the breeding season, tropicbirds form a group of 2-20 birds and fly around one another, swinging their tail streamers from side to side for several minutes to attract the female bird. Their courtship displays are complex and consist of flying backwards, vertically, and in large, vertical circles.