Ключевые слова: adrea, animal, avian, beak, beautiful, beauty, bird, birdwatching, black, blue, cinerea, conservation, danube, delta, ecology, environment, fauna, feather, flight, fly, flying, forest, grace, graceful, gray, great, grey, habitat, heron, hunter, majestic, natural, nature, ornithology, outdoor, pond, profile, river, shore, silhouette, water, water bird, wild, wildlife, wings, zoology,