Brown-headed Cowbird

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A brown-headed cowbird at Breakneck Hill Conservation Land in Southborough, photographed by Steve Forman.
Steve Forman photographed this brown-headed cowbird at Breakneck Hill Conservation Land in Southborough.
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A brown-headed cowbird at Breakneck Hill Conservation Land in Southborough, photographed by Steve Forman.
Steve Forman photographed these brown-headed cowbirds at Breakneck Hill Conservation Land in Southborough.
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A brown-headed cowbird at Breakneck Hill Conservation Land in Southborough, photographed by Steve Forman.
Steve Forman photographed a brown-headed cowbird, a European starling, a red-winged blackbird, and a song sparrow at Breakneck Hill Conservation Land in Southborough.
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A brown-headed cowbird at Breakneck Hill Conservation Land in Southborough, photographed by Steve Forman.
Steve Forman photographed a brown-headed cowbird, an eastern kingbird, a northern flicker, and a scorpionfly at Breakneck Hill Conservation Land in Southborough.
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Brown-headed cowbirds at Breakneck Hill Conservation Land in Southborough, photographed by Steve Forman.
Steve Forman photographed brown-headed cowbirds, an eastern kingbird, a red-winged blackbird, and a yellow warbler at Breakneck Hill Conservation Land in Southborough.
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A brown-headed cowbird at Assabet River National Wildlife Refuge in Sudbury, photographed by Dan Trippe.
Dan Trippe photographed a brown-headed cowbird and a northern flicker at Assabet River National Wildlife Refuge in Sudbury.
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A brown-headed cowbird at Breakneck Hill Conservation Land in Southborough, photographed by Steve Forman.
Steve Forman photographed a brown-headed cowbird, a house finch, a northern flicker, and a northern mockingbird at Breakneck Hill Conservation Land in Southborough.
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A brown-headed cowbird at Breakneck Hill Conservation Land in Southborough, photographed by Steve Forman.
Steve Forman photographed a brown-headed cowbird and European starlings at Breakneck Hill Conservation Land in Southborough.
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An American robin at Breakneck Hill Conservation Land in Southborough, photographed by Steve Forman.
Steve Forman photographed an American robin, a brown-headed cowbird, a northern cardinal, and a red-winged blackbird at Breakneck Hill Conservation Land in Southborough.
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A brown-headed cowbird fledgling begs for food from a yellow warbler at Upton State Forest.
Eileen Samberg photographed this yellow warbler feeding a brown-headed cowbird fledgling at Upton State Forest. Brown-headed cowbirds are known as "brood parasites;" the female will lay eggs in other birds...