Tundra Swans, sometimes called, ‘whistling swans,’ come to regional national wildlife refuges and this area when winter weather up north sends them on their annual migration south. Hardly a whistle, Tundra Swans sound more like an old-style bulbous bicycle horn. They’re loud, large and gather in flocks. Utilizing ponds, lakes and flooded fields in which to feed and rest, they are shown here on Alligator River Refuge.