
A tourist takes pictures of a brown-headed gull along the bank of Nam Co Lake in southwest China's Tibet Autonomous Region, July 5, 2019. (Xinhua/Zhou Jinshuai)

Brown-headed gulls are seen along the bank of Nam Co Lake in southwest China's Tibet Autonomous Region, July 5, 2019. (Xinhua/Zhou Jinshuai)

Brown-headed gulls are seen along the bank of Nam Co Lake in southwest China's Tibet Autonomous Region, July 5, 2019. (Xinhua/Zhou Jinshuai)