Ключевые слова: against, air, animal, background, beautiful, biosphere, bird, blue, cloud, danube, delta, ecosystem, environment, fauna, flight, flock, fly, flying, formation, freedom, great, group, heritage, in, journey, large, life, many, migrating, migration, natural, nature, outdoor, park, pelican, pelicans, reserve, romania, silhouette, sky, summer, the, v, vformation, vshaped, water, white, wild, wildlife, wings,