Animal, Anthus, Sparrow, Finch, alive, animal, background, beak, bill, biodiversity, biology, bird, birding, birdwatching, brown, climate, cold, conservation, day, ecology, environment, environmental, fauna, feathers, gray, grey, ground, horizontal, ice, life, living, mockingbird, nature, northern, organism, ornithology, outdoors, outside, passerine, scene, science, season, seasonal, snow, songbird, vertebrate, walking, warm-blooded, weather, wild, wildlife, wing, winter, zoology, outdoor, middle english, walk, earth, skill, passage, low temperature, discipline, twenty-four hours, mood, precipitation, direction, life science, improvement, feather, heterogeneity, indo-european, land, mouth, difference, nonuniformity, document, west germanic, orifice, germanic, oscine, diverseness, experience, transformation, crystal, coldness, temperature, writing, english, situation, dissimilarity