Shine white than snow white.

Large, snow-white swans that look graceful as they swim slowly on the water surface come to Japan to overwinter, but Whooper Swans can only be seen in cold regions such as Hokkaido and the Tohoku region. They look great swimming on the snow-covered surface of the lake, and very beautiful birds that shine even whiter than the snow, and when they spread their wings, you will be even more surprised by the size.
In cold regions, the water in ponds and lakes may freeze, but when the water freezes, carnivorous animals cross over the ice to attack the swans, so an environment surrounded by water is necessary.