Animalia, Aves, Chordata, Hirundinidae, North America, Passeriformes, T. bicolor, Tachycineta, Tachycineta bicolor, US, USA, Wisconsin, adult, beautiful, bicolored, bird, bird house, birdhouse, blue, blue-green, cavity nest, exit, exiting, fauna, feathers, iridescent, leave, leaving, natural, nature, nest, nest box, nest cavity, north american, north woods, northern, northwoods, outdoors, song bird, songbird, spring, spring time, springtime, striking, swallow, tree swallow, wild, wildlife, wren house, songbird, song bird, bird, backyard bird, backyard