I had a similar experience in my small yard - the local Song Sparrows had two broods, both times consisting of 1 Brown-headed Cowbird (if a brood can consist of 1 bird).
Good birding, Paul Pisano Arlington, VA
On Tuesday, August 14, 2012, Jim Nelson wrote:
> Through this summer in our small back yard, we have had a number of > observations of individual Song Sparrows feeding a juvenile Brown-headed > Cowbird (far enough apart that they represent different broods). Today we > were amazed to see a Song Sparrow feeding TWO juvenile Cowbirds. Over the > years we have seen Song Sparrows feeding Cowbirds in our yard but never any > other species feeding Cowbirds. So here in Bethesda, Montgomery County, it > appears that Song Sparrows are the primary hosts for our local Cowbirds. > > Jim Nelson > Bethesda, MD >
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