Introduction to Little Swans: Little Swans belong to the second-level national protection. The overwintering period starts from the end of October and lasts until April of the following year. They are mainly distributed in the middle and south of the Upper Lake. Groups of about 100 are also common in the Lower Lake. They are mainly taken from It feeds on the tubers of submerged aquatic plants and occasionally on the leaves of tidal flat vegetation, mainly Carex.