Tree, Tree Trunk, alive, animal, aves, background, bark, beak, bill, biodiversity, biology, branch, conservation, day, ecology, environment, environmental, fauna, feathers, forest, horizontal, kinglet, life, living, limb, natural, nature, olive, organism, ornithology, outdoors, outside, passerine, perched, ruby-crowned, scene, scenery, science, small, songbird, tiny, tree, vegetation, vertebrate, warm-blooded, wild, wilderness, wildlife, wings, wood, woods, zoology
Ruby-crowned kinglet (Regulus calendula) perched on a large tree branch