whooper swans (cygnus cygnus) wintering in a frozen meadow during a very cold winter

alsacechampagneardennelorraine animal beak biology bird climate daylight ecology ecosystem elegance elegant environment fauna feather frost graceful habitat ice icy lake life migration migratory natural nature ornithology peaceful plumage rural season swan water waterbird waterfowl white wild wilderness wildlife zoology whooper swans cygnus wintering frozen meadow cold winter winter alsace france