Ключевые слова: agano, animal, beautiful, beauty, bird, bird watching, birdwatching, blue, blue sky, chubu, fauna, flight, fly, hokuriku, hyoko, japan, lake, marsh, migrating, migration, migratory, natural, nature, niigata, pond, sky, swamp, swan, watching, wet, wetland, whistling, whistling swan, white, wild, wildlife, wing, winter,