View of Qinghai Lake in NW China

This photo taken on April 14, 2023 shows ruddy shelduck flying above the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Long)

This photo taken on April 14, 2023 shows brown-headed gulls flying above the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)

This photo taken on April 14, 2023 shows a bar-headed goose resting in the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Long)

This aerial photo taken on April 15, 2023 shows a view of the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Long)

This aerial photo taken on April 15, 2023 shows a view of the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)

This photo taken on April 13, 2023 shows a brown-headed gull foraging in the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Long)

This photo taken on April 13, 2023 shows brown-headed gulls flying above the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Long)

This photo taken on April 13, 2023 shows a brown-headed gull flying above the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)

This aerial photo taken on April 15, 2023 shows a view of the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Long)

This aerial photo taken on April 15, 2023 shows a view of the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Long)

This photo taken on April 13, 2023 shows brown-headed gulls flying above the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)

This aerial photo taken on April 15, 2023 shows a view of the Qinghai Lake in northwest China's Qinghai Province. (Xinhua/Zhang Hongxiang)