Ключевые слова: abstract, animal, animal mating, autumn, background, beautiful, bird, birdhouse, birds, birds nest, birds nests, black, blue, branch, colony, corvus, crow, crows nest, day, environment, fauna, flora, forest, frugilegus, group, landscape, leafless, natural, nature, nest, ornithology, outdoor, outdoors, park, plant, raven, rook, season, silhouette, sky, spring, texture, tree, tree branch, trees, wild, wild life, wildlife, winter, wood,