Ключевые слова: anser anser, birds, body parts, breeding plumage, cluster, coat, dugs, europe, feather, feathering, flight, flock, flying, formation flight, geese, germany, goose, greylag geese, greylag goose, lake kummerow, migrating, nuptial plumage, swarm, water birds, waterfowl, western pomerania,