Ключевые слова: animal, beak, bird, bird box, bird house, birdhouse, birdwatching, blue tit, bluetit, box, breeding, brood, caeruleus, chicks, city, cyanistes, family, feather, fledgeling, fledgling, forest, garden, great tit, habitat, hole, house, nature, nest, nest box, nestbox, nesting box, nestlings, nurture, ornithology, outdoors, parus, parus caeruleus, passerine, songbird, spring, town wildlife, tree, urban, wild, wildlife, wing, wood, young,