American birds, American songbirds, Animalia, Aves, Chordata, Eukaryota, H. leucocephalus, June, New World warbler, North America, Parulidae, Passeriformes, US, USA, V. chrysoptera, Vermivora, Vermivora chrysoptera, Wisconsin, adult, aspen, aspen branch, aspen tree, aspen tree branch, aspen trees, avian, bird, birding, birdlife, birdwatching, black, black throat, blue, declining numbers, early successional habitat, endangered, endangered songbird, fauna, feathers, forest, golden-winged warbler, gray, green, grey, late spring, male, male golden-winged warbler, male songbird, male warbler, natural, nature, near threatened, north, north american, north woods, northern, northern Wisconsin, northwoods, ornithology, rare bird, rare species, song bird, songbird, spring, springtime, summer, summer time, summertime, tree, tree branch, trees, warbler, white, white tail feathers, wild, wildlife, woodland, woodlot, woods, yellow, yellow crown