Marines would have manned this instant pillbox with machine guns had the Japanese forces attempted a landing. These obsolete World War I tank turrets were accessed by culverts and would have been the last line of defense.
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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.