Ключевые слова: adult, animal, ardea, ardea cinerea, background, beak, beautiful, big, bird, birds, birdwatching, blue, buzzer, cinerea, colorful, danube, danube delta, delta, europe, eye, fauna, feather, feathers, fly, gray, gray heron, green, heron, herons, jump, lake, natural, nature, ornithology, outdoor, plumage, pond, river, romania, wader, wading bird, water, white, wild, wilderness, wildlife, wing, wings, wood,