Ключевые слова: activity, adaptation, aquatic, behavior, birds, chill, city, cold, community, drakes, ducks, ecosystem, environment, feather, feeding, flapping, flock, foraging, frozen, grazing, group, habitat, hen, ice, landscape, mallard, migration, nature, nesting, peaceful, pond, quack, quacking, reflection, resting, scenic, seasonal, serenity, snow, social, spring, swimming, tranquil, urban, urbanization, waddle, water, wildlife, winter,