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[[image]] B.S. 25967. Colony of Frigate Birds. Necker Island. June 19, 1923. [[image]] B.S. 25968. Colony of Frigate Birds. Laysand Island. May 3, 1923. [[image]] B.S. 25970. Male Frigate Birds with throat sac inflated. Bird on left is past breeding and sac has begun to shrink. Laysan Island. May 2, 1923.