Ключевые слова: animal behavior, animals, annual, autumn, avian, birds, blue sky, bluff, clouds, ecology, environment, fall, flight, flock, flying, forest, going south, hill, migration, migratory birds, movement, nature, pelicans, seasons, sky, south, travel, trees, waterbirds, waterfowl, weather, white, wilderness, wildlife, wings, winter preparation, woods,