Ключевые слова: activity, adult, anas platyrhynchos, autumn, behaviour, big flock, bird, countryside, drake, duck, eastern europe, fauna, female, flock, group, habitat, large flock, male, mallard, many, migratory, motion, open water, ornithology, outdoors, river, rural, selective focus, side view, springtime, summer, swim, water, waterfowl, wild duck, wildlife,