Ключевые слова: aerodynamics, autumn, baltic sea, beach, biology, bird, bird migration, bird watching, birding, birds, birdwatching, blue, change, clean nature, clouds, colony, duck flock, ducks, ecology, environment, estonia, fall, flock, fly, flying, formation, freedom, group, huge, leaving, life, massive, migrating, migration, nature, north, northern europe, ornithology, rural, scenic, sea, season, sky, south, specie, travel, watching, water, wild, wildlife,