Thousands of swallows gather on electric wires in a street in Nanning, south China's Guangxi Zhuang Autonomous Region, June 8, 2020. /CFP

The scene of the birds occupying the electric wires resembled sheet music. /CFP

A resident living in the area said that starting from July these birds have gathered every night and would usually leave the next morning. She said that their visit was a view appreciated by many but they could be noisy sometimes. /CFP