American birds, American songbirds, Animalia, Aves, Chordata, Eukaryota, H. leucocephalus, May, New World warbler, North America, Parulidae, Passeriformes, US, USA, V. chrysoptera, Vermivora, Vermivora chrysoptera, Wisconsin, adult, aspen tree, aspen tree branch, avian, bird, birding, birdlife, birdwatching, black, black throat, declining numbers, early successional habitat, endangered, endangered songbird, fauna, feathers, forest, golden-winged warbler, gray, grey, male, male golden-winged warbler, 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, tree, tree branch, warbler, white, white tail feathers, wild, wildlife, woodland, woodlot, woods, yellow, yellow crown