Ключевые слова: animal, bill, bird, blue, box, brood, caeruleus, chick, colorful, crowd, crowded, environment, family, feather, fledge, fledgeling, full, garden, green, group, habitat, hatch, helpless, hole, home, life, many, natural, nature, nest, nestbox, nestling, nurse, nurture, parus, passerine, sibling, small, songbird, spring, tit, tree, unfledged, weak, white, wild, wildlife, wood, yellow,