Vídeo de About a dozen tundra swans (Cygnus columbianus) in V formation above Oyama Shimo-ike Pond

About a dozen tundra swans (Cygnus columbianus) in V formation above Oyama Shimo-ike Pond; Oyama Shimo-ike is a manmade pond (covering approximately 24 ha) situated west of the city of Tsuruoka, It was created about 400 years ago to provide irrigation water for farming, It is an important habitat for almost 200 species of birds, and is listed under the Ramsar Convention, Every year, some 1,000 to 3,000 tundra swans (Cygnus columbianus) winter here, The tundra swan, a member of the Anatidae family of ducks, geese, and swans, is a migratory bird that grows to a height of about 1,2 m, It breeds in cold parts of Siberia and elsewhere, and winters in temperate lakes and marshes, including those in Japan.