Tree, Tree Trunk, Food, Nut, Produce, Vegetable, Animal, Bird, Finch, Grain, Leaf, Bud, Flower, Sprout, Seed, Accipiter, Sparrow, alive, animal, background, beak, bill, biodiversity, biology, branch, conservation, day, ecology, environment, environmental, fauna, feathers, foraging, hanging, head, kinglet, life, limb, living, natural, nature, organism, ornithology, outdoors, outside, passerine, perched, red, ruby-crowned, scene, scenery, science, sky, small, songbird, tiny, tree, vegetation, vertebrate, vine, warm-blooded, weather, wild, wilderness, wildlife, wings, zoology, outdoor, diminutive, decoration, achiever, warbler, writing, skill, passage, discipline, twenty-four hours, implementation, dissimilarity, life science, improvement, woody plant, crimson, feather, heterogeneity, bird, division, means, plant, mouth, disfavor, bantam, difference, nonuniformity, document, orifice, search, oscine, rejection, diverseness, experience, transformation, person, situation
Ruby-crowned kinglet (Regulus calendula) looking around curiously as it hangs from a tree limb