. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 171 May 2. Many eggs have been destroyed by storms since I was here last. Males that have enticed a female to the nest extend the balloons fully and swing them from side to side rubbing them against the breast of the female who rested opposite, apparently inattentive. With mating over the male takes on part of the duty of incubation. The pouch â â. Figure 47. Eric Schlemmer with two adult male frigatebirds with throat sacs fully distended. Bird at right is mating. The one at left has beun incubation and sac is
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 171 May 2. Many eggs have been destroyed by storms since I was here last. Males that have enticed a female to the nest extend the balloons fully and swing them from side to side rubbing them against the breast of the female who rested opposite, apparently inattentive. With mating over the male takes on part of the duty of incubation. The pouch â â. Figure 47. Eric Schlemmer with two adult male frigatebirds with throat sacs fully distended. Bird at right is mating. The one at left has beun incubation and sac is shrinking in size. Laysan Island. May 2, 1923. [Another photograph of these birds was used to illustrate a note that arose in correspondence between Wetmore and F. N. Chasen, regarding the disappearance of the throat sac in male frigatebirds in the nonbreeding season (Wetmore, 1938).]. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Press; National Research Council (U. S. ). Pacific Science Board; Smithsonian Institution; National Museum of Natural History (U. S. ); United States. Bureau of Sport Fisheries and Wildlife. Washington, D. C. : [Smithsonian Press]
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