Change: plumage, one (rare,(less not shown on photo)common) with uniformunstreaked pale underparts.96 cowbird stomachs from Yunguilla contained corn (65%), ticks (Ixodes) (34%), insects (18%), seeds (14%) and blackberries (Rubus sp.) (3%).Photos by Aldo Fernando SornozaPhoto by Niels KrabbePhoto by Aldo Fernando Sornoza   View changes from previous version. (Word count: 301)

Change: Two morphs of females occur, one (the commonest) beginning with streaked plumage and terminating with uniform dull black plumage, one (rare) with uniform pale underparts.96 cowbird stomachs from Yunguilla contained corn (65%), ticks (Ixodes) (34%), insects (18%), seeds (14%) and blackberries (Rubus sp.) (3%).Photos by Aldo Fernando Sornoza   View changes from previous version. (Word count: 300)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 266)

Change: The population size was monitored during the peak of the vocal period (March), except for 1999 and 2000 when it was monitored in February and May, and in April, respectively. Cowbird parasitism on Atlapetes pallidiceps was first noted by Krabbe   View changes from previous version. (Word count: 268)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 238)

Change: at Yunguilla are weighed, sexed, investigated for stomach contents, and carefully prepared as study skins. See attached file below (cowbird data.xls) for details. 96 cowbird stomachs from Yunguilla contained corn (65%), ticks (Ixodes) (34%), insects (18%), seeds (14%) and blackberries (Rubus sp.) (3%).Photos by Aldo Fernando SornozaPhoto   View changes from previous version. (Word count: 238)

Change: documented (photo).documented.As a consequence, cowbird control by shooting commenced in 2003, and has been undertaken highly successfully by Aldo Fernando Sornoza (photo) during all following breeding seasons, with the result that parasitism has been reduced to only one or two nests anually.All collected cowbirds   View changes from previous version. (Word count: 135)

Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 138)

Change: reduced to only one or two nests anually.All collected cowbirds are weighed, sexed, investigated for stomach contents, and carefully prepared as study skins (photo). See attached file below (cowbird data.xls) for details.Photo by Aldo Fernando SornozaPhoto by Aldo Fernando Sornoza   View changes from previous version. (Word count: 134)

Change: cowbird control by shooting commenced in 2003, and has been undertaken highly successfully by Aldo Fernando Sornoza (photo) during all following breeding seasons.All collected cowbirds are weighed, sexed, investigated for stomach contents, and carefully prepared as study skins (photo). See attached file below (cowbird data.xls) for details.   View changes from previous version. (Word count: 108)