Brown-headed Cowbird

Steve Forman photographed a pair of brown-headed cowbirds at Breakneck Hill Conservation Land in Southborough.

Steve Forman photographed an American tree sparrow, a brown-headed cowbird, a house sparrow, a red-tailed hawk, and a white-throated sparrow at Breakneck Hill Conservation Land in Southborough.

Gail Sartori photographed a Canada goose, a Cooper's hawk, red-winged blackbirds, a brown-headed cowbird, and a yellow-rumped warbler at the Assabet River National Wildlife Refuge in Maynard.

Steve Forman photographed a brown-headed cowbird and a spotted sandpiper at Hager Pond in Marlborough.

Roel Daling photographed brown-headed cowbirds, common grackles, red-winged blackbirds, eastern chipmunks, and an onlooking red-tailed hawk in Sudbury.

Jon Turner photographed a painted turtle, a tree swallow, an eastern bluebird, a turkey vulture, a broad-winged hawk, a brown-headed cowbird, an eastern phoebe, a red-bellied woodpecker, and a red...

Connie Schlotterbeck photographed this pair of brown-headed cowbirds at the Community Gardens in Wayland.

Steve Forman photographed a pair of brown-headed cowbirds and a downy woodpecker at Breakneck Hill Conservation Land in Southborough.

Steve Forman photographed a black-capped chickadee, a brown-headed cowbird, an eastern phoebe, a northern cardinal, and a red-bellied woodpecker at Breakneck Hill Conservation Land in Southborough.

Sandy Howard photographed a European starling (front, right) and a brown-headed cowbird in Northborough.