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