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