Ключевые слова: abstract, air, animal, background, beautiful, bevy, biology, bird, birds, birds in the sky, black, blue, clouds, cloudy, colony, crow, crows, cutout, day, fauna, flare, flight, flock, fly, formation, freedom, group, life, lot, many, migrating, migration, motion, move, natural, nature, nobody, ornithology, outdoor, outdoors, pattern, raven, scenic, season, silhouette, sky, wild, wildlife, wing,