Ключевые слова: anatidae, animal, anseriformes, biology, bird, birds nest, breed, breeding, brooding, care, conservation, cygnus, daytime, eggs, environmental, fauna, feather, female, guard, guarding, habitat, hatched, hatching, horizontal, looking, mother, mulch, mute swan, nature, nature reserve, nest, ornithology, outdoors, outside, procreation, reed, reproduction, season, sitting, spring, swan, swans, tending, twigs, vertebrates, watching, white, wild, wilderness, wildlife,