Ключевые слова: aggressive, america, animal, arbor, auritum, beak, bill, bird, black, blue, branch, colorado, conservation, couple, crested, denver, diver, diving, double, doublecrested, environment, eyes, fauna, feathers, fish, fishing, floats, full, hunter, lake, moon, naked, nannopterum, natural, nature, ornithology, outdoor, pair, park, plumage, predator, sharp, sky, species, swims, tree, water, waterbird, wildlife, wings,