The largest waterfowl is the swan, which has a wingspan of up to 3.1 meters (10 feet). Swans are found on every continent except Antarctica and are known for their graceful swimming and flying abilities. They are also known for their loud honking calls and long necks. Swans are omnivorous, eating both aquatic plants and small animals. They are also highly social birds, often forming lifelong bonds with their mates.