Ключевые слова: animal, artificial, baby, beak, bird, bird box, bird house, blue tit, box, brood, caeruleus, chick, colorful, crowd, crowded, family, fauna, feather, fledge, fledgeling, full, garden, grass, green, group, habitat, hole, home, interior, many, moss, nature, nest, nestbox, nestling, nine, nurture, parus, passerine, sibling, songbird, spring, tit, unfledged, watch, wild, wildlife, wood, yellow,