The Tundra Swan is a large species of waterfowl that is found in northern parts of both the Old and New Worlds. It is migratory; Old World birds breeding across Siberia and winter in southeastern parts of Asia or northwestern Europe, while New World birds breed in parts of Alaska and extreme northern Canada, spending the winter along the Pacific and Altantic Coasts.
The two separate Tundra Swans are divided into two subspecies, Bewick's Swan in the Old World and Whistling Swan in the Americas. Some taxonomies consider them two different species.
As their name indicates, Tundra Swans breed nearby water in tundra habitat. They feed mainly on vegetation, both aquatic and terrestrial. They occasionally feed on invertebrates and small aquatic animals.