Cygnets, Young Swans

Several species are migratory, either wholly or partly so. The Mute Swan is a partial migrant, being resident over areas Western Europe but wholly migratory in Eastern Europe and Asia. The Whooper Swan and Tundra Swan are wholly migratory, and the Trumpeter Swans are almost entirely migratory. There is some evidence that the Black-necked Swan is migratory over part its range, but detailed studies have not established whether these movements are long or short range migration.
Behavior
Swans feed in the water and on land. They are almost entirely herbivorous, although small numbers aquatic animals may be eaten. In the water food is obtained by up-ending or dabbling, and their diet is composed the roots, tubers, stems and leaves aquatic and submerged plants.