. Life histories of North American petrels and pelicans and their allies; order Tubinares and order Steganopodes . ccount in the same chapter of the ceremony of nest relief,which I have never seen, is also worth quoting. Brown pelicans do not differ in color sexually. It is impossible, therefore,to determine by external appearance the sex of the sitting bird. Observationfrom a blind, however, reveals the fact that both sexes incubate, the changeof places being usually preceded by an interesting little performance which Ihave called the Ceremony of Nest Relief. As a rule the bird on the nest is
. Life histories of North American petrels and pelicans and their allies; order Tubinares and order Steganopodes . ccount in the same chapter of the ceremony of nest relief,which I have never seen, is also worth quoting. Brown pelicans do not differ in color sexually. It is impossible, therefore,to determine by external appearance the sex of the sitting bird. Observationfrom a blind, however, reveals the fact that both sexes incubate, the changeof places being usually preceded by an interesting little performance which Ihave called the Ceremony of Nest Relief. As a rule the bird on the nest is notattended by its mate, who may be feeding, bathing, resting on the shore, orsailing high in the air. The returning bird alights near the nest and, withbill pointed to the zenith, advances slowly, waving its head from side to the same time the sitting bird sticks its bill vertically into the nest, twitchesits half-spread wings, and utters a low, husky, gasping chuck, tlie only note Ihave ever heard issue from the throat of an adult wild brown pelican. After U. S. NATIONAL MUSEUM BULLETIN 121 PL. 6!^. LouiaiuiK.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbirdsno, bookyear1922
