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1743. Two adult male Frigate birds with throat sacs fully distended. Bird at left is mating and has sac full size. The bird at right has begun incubation and sac is beginning to shrink. Laysan Island.
May 2, 1923.

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1744. Eric Schlemmer with two adult male Frigate Birds with throat sacs fully distended. Bird at right is mating. The one at left has begun incubation and sac is shrinking in size. Laysan Island.
May 2, 1923.

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B.S. 25971. Immature Frigate Bird. Johnston Island.
July 12, 1923.