Adult swans often mate for life. They build nests near water from reeds and rushes then line it with down. It takes up to three weeks for the nest to be completed. A pen normally lays several 4-inch eggs at intervals of 12 to 24 hours between eggs. Once the eggs are laid, the incubation period begins and lasts for about six weeks. Cygnets live with their parents for approximately six months, but may stay around the flock for up to four years.
Though the cygnets are able to swim, they can also be seen riding on their parents' backs when they tire. They're able to fly after about two months, and their parents drive them off before the next clutch of cygnets is produced.Learn more about Zoology