Ключевые слова: animal, attentive, avian, bad ecology, beak, biology, bird, bird life, birds of europe, birdwatching, clever bird, common crow, corvus cornix, crow, cyanobacteria, europe, fauna, feather, flight, granite stone, gray crow, green algae, grey, hooded, hooded crow, horizontal, humanlevel intelligence, large, natural, nature, ornithology, outdoors, plumage, raven, river, rock, sea, single, sitting, smart animals, standing, summer, top, watching, water, wild, wild animal, wildfowl, wildlife, wings,