Ключевые слова: animal, ardea cinerea, background, beak, beautiful, biosphere, bird, birdwatching, blue sky, danube delta, danube river, delta, ecosystem, europe, eye, fauna, feather, flight, grey heron, heron, landscape, life, natural, nature, ornithology, outdoor, reservation, river, romania, scenery, spring, springtime, tourism, travel, view, wild, wilderness, wildlife, wildlife reserve, wings,