. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fig. 2. Variation in the size of the casque of Oreop/ios/s derbianus. Left: fully developed, and right: partly developed casque. (no casque) inhabits New Guinea, the western Papuan Islands and the Aru Islands, and insolifus (with casque) is found on the Bismarck Archipelago (Cain, 1954). That the casque and fleshy protuberance are no more than species-specific recogni- tion marks is further suggested by tlie func- tion of the white frontal shield of the coot Fulica americana. The sliield is an exten- sion of the rhamp
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fig. 2. Variation in the size of the casque of Oreop/ios/s derbianus. Left: fully developed, and right: partly developed casque. (no casque) inhabits New Guinea, the western Papuan Islands and the Aru Islands, and insolifus (with casque) is found on the Bismarck Archipelago (Cain, 1954). That the casque and fleshy protuberance are no more than species-specific recogni- tion marks is further suggested by tlie func- tion of the white frontal shield of the coot Fulica americana. The sliield is an exten- sion of the rhamphotheca over the fore- head, surmounted by tlie reddish callus. Gullion (1951) succeeded in producing larger shields by implanting testosterone subcutaneously. He showed that the shield is used in aggressive territorial displays, and that "paired birds are able to recognize their mates by the shape of the ;. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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