Ключевые слова: america, animal, aquatic, avian, bird, birds, birdwatching, blue, ca, california, copy space, directly above, drake, duck, ecology, environment, female, flight, flock, flying, formation, fowl, free, game, gliding, group, low angle view, male, migration, nature, northern shoveler, outdoor, park, protected, refuge, san francisco bay, season, shoveler, sky, soaring, spread wings, three, united states, usa, view from below, water fowl, waterfowl, wild, wildlife, wings,