Mother duck hatched her ducklings from eggs. However, the last egg contained an unusually large and ugly duckling. The other animals disliked and mocked the duckling for its appearance. Over time, the duckling grew sad and lonely as it did not fit in. During winter, the duckling saw swans for the first time and wished to be as beautiful as them. Later, the duckling saw its reflection and realized it had transformed into a graceful swan.