Cygnus cygnus, Whooper swans, on a frozen lake in Hokkaido, Hokkaido, Japan

animal behaviour spreading wings flapping landing condition frozen 1 animal nobody temperature cold animal chordate vertebrate bird water bird freshwater bird water frozen water snow standing water lake water surface non urban scene landscape outdoors season winter day nature beauty in nature wildlife animals in the wild physical geography travel place of interest travel destinations swan whooper swan cygnus cygnus whooper swans hokkaido japan