Ключевые слова: action, animal, avian, biology, bird, birding, birdwatching, cooperate, dynamic, environment, flight, flock, fly, flying, group, life, marsh, migration, migratory, movement, moving, multiple, nature, ornithology, performance, soaring, species, speed, swamp, team, training, velocity, wader, watching, water, waterfowl, wetland, wild, wild animal, wildlife, wing, zoology,