Ключевые слова: animal, beak, bird, bird box, bird house, birdwatching, blue tit, bluetit, branch, caeruleus, cyanistes, cyanistes caeruleus, environment, eurasian, eurasian blue tit, fauna, feathers, forest, garden, garden bird, habitat, mating, moss, natural, nature, nest, nest building, nesting, ornithology, outdoors, park, parus, parus caeruleus, passerine, perched, perching, plumage, reproduction, singing bird, songbird, spring, tit, titmouse, town, tree, twig, urban wildlife, wild, wildlife, woodland,