Tree Swallow

Nancy Wright photographed this mating pair of tree swallows in Grafton.

Steve Forman photographed an American goldfinch, a bee, a cabbage white butterfly, tree swallows, a red-tailed hawk, and a ruby-throated hummingbird at Breakneck Hill Conservation Land in Southborough.

Steve Forman photographed a great blue heron with a fish, a marsh wren, a red-winged blackbird, a tree swallow catching a feather, and a warbling vireo in its nest at...

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.