Do swallows in Suzhou also fly south?

Swallows in Suzhou do not fly to the south. According to relevant information, Suzhou belongs to the south, and swallows in Suzhou don't fly to the south. The dividing line between north and south is Qinling and Huaihe River. The area south of the Huaihe River in Qinling belongs to the south, and the area north belongs to the north. Suzhou is a prefecture-level city in Jiangsu Province, located in the southeast of Jiangsu Province, in the middle of the Yangtze River Delta, bordering Shanghai in the east, Jiaxing in the south, Taihu Lake in the west, the Yangtze River in the north and Huaihe River in the Qinling Mountains in the north.