Brown-headed Cowbird

Steve Forman photographed an American robin, great blue herons at their nests, a bathing brown-headed cowbird, cedar waxwings, an eastern kingbird, a ruby-throated hummingbird, yellow warblers, a northern mockingbird, a...

Jon Turner photographed a brown-headed cowbird, a painted turtle, and a yellow-rumped warbler at Bowers Springs in Bolton.

Nancy Wright photographed a northern mockingbird, song sparrows, a brown-headed cowbird, a common grackle, an American robin, and a black-capped chickadee in Westborough.

Nancy Wright photographed a brown-headed cowbird, an eastern kingbird, an eastern wood-pewee, and a yellow warbler at Lake Chauncy in Westborough.

Steve Forman photographed this brown-headed cowbird at Breakneck Hill Conservation Land in Southborough.

Steve Forman photographed these brown-headed cowbirds at Breakneck Hill Conservation Land in Southborough.

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.

Steve Forman photographed a brown-headed cowbird, an eastern kingbird, a northern flicker, and a scorpionfly at Breakneck Hill Conservation Land in Southborough.

Steve Forman photographed brown-headed cowbirds, an eastern kingbird, a red-winged blackbird, and a yellow warbler at Breakneck Hill Conservation Land in Southborough.

Dan Trippe photographed a brown-headed cowbird and a northern flicker at Assabet River National Wildlife Refuge in Sudbury.