Tree Swallow

Jon Turner photographed a gray catbird, a hermit thrush, a red-winged blackbird, and tree swallows at SVT's Smith Conservation Land in Littleton.

Steve Forman photographed an American goldfinch, a northern cardinal, a red-tailed hawk, a pair of red-winged blackbirds, and a tree swallow at Breakneck Hill Conservation Land in Southborough.

An American goldfinch and a tree swallow at Breakneck Hill Conservation Land in Southborough, photographed by Steve Forman.

Steve Forman photographed a tree swallow, a mallard, a mute swan, and a painted turtle at Hager Pond in Marlborough.

Steve Forman photographed a common grackle, a red-winged blackbird, a tree swallow, and a pair of wood ducks at Great Meadows National Wildlife Refuge in Concord.

Steve Forman photographed hooded mergansers, tree swallows, buffleheads, and ring-necked ducks at MacCallum Wildlife Management Area in Northborough.

Steve Forman photographed this tree swallow at MacCallum Wildlife Management Area in Northborough.

Steve Forman photographed these tree swallows in Grafton.

Steve Forman photographed tree swallows at Breakneck Hill Conservation Land in Southborough.

Steve Forman photographed tree swallows at Breakneck Hill Conservation Land in Southborough.