. Life histories of North American petrels and pelicans and their allies; order Tubinares and order Steganopodes . ng about soas to interpose its body between its nest and the threatening danger. The de-fense being so spirited and gallant I concluded that the eggs were far ad-vanced in incubation. I several times found the present species sitting on large sea shells, whichin shape and size somewhat resembled their eggs. The boobies seemed per-fectly contented with the substitute, and I often supplied them with theshells after taking their eggs. These they immediately tucked under theirbreasts
. Life histories of North American petrels and pelicans and their allies; order Tubinares and order Steganopodes . ng about soas to interpose its body between its nest and the threatening danger. The de-fense being so spirited and gallant I concluded that the eggs were far ad-vanced in incubation. I several times found the present species sitting on large sea shells, whichin shape and size somewhat resembled their eggs. The boobies seemed per-fectly contented with the substitute, and I often supplied them with theshells after taking their eggs. These they immediately tucked under theirbreasts with their bills, and accepted the change as a matter of course. Onenest, from which I took one egg, was supplied Vv-ith two shells. Both weretucked away, but next day I found that one had been discarded. Others whichwere incubating two eggs accepted two shells in exchange and were sitting onthem ten days later, when we left the island. Eggs.—The set generally consists of two eggs, though sometimesonly one. The shape varies from ovate to elongate oval or short fusi- U. S. NATIONAL MUSEUM BULLETIN 121 PL. 30. Laysan Island. W. K. Fisher.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbirdsno, bookyear1922