Ключевые слова: above, air, animal, areas, background, biosphere, birds, black, cloud, crane, day, destination, ecological, environmental, flight, flock, flying, formation, freedom, group, harmony, landscape, migrate, migration, migratory, natural, nature, nobody, nonurban, ornithological, ornithology, outdoor, picturesque, plumage, protection, rainy, scene, season, seasonal, sky, skyline, system, tourist, tranquility, travelling, wildlife, wing, wintering,