Animalia, Aves, Chordate, L. ruficapilla, Leiothlypis, Leiothlypis ruficapilla, May, Nashville Warbler, North America, Parulidae, Passeriformes, US, USA, Wisconsin, adult male, aspen, aspen tree, bird, forest, forest edge, forest's edge, gray, grey, male, male Nashville warbler, male bird, male songbird, male warbler, natural, nature, north american, north woods, northern, northern Wisconsin, northwoods, perch, perched, sing, singing, song bird, songbird, spring, tree, tree branch, trees, warbler, white eye-ring, wild, wildlife, wood warbler, woodland, woods, yellow