
Relict gulls (larus relictus) are seen at the Hongjiannao Wetland Reserve in Shenmu, northwest China's Shaanxi Province, June 3, 2021.Photo:Xinhua

Relict gulls (larus relictus) are seen at the Hongjiannao Wetland Reserve in Shenmu, northwest China's Shaanxi Province, June 3, 2021.Photo:Xinhua

Relict gulls (larus relictus) are seen at the Hongjiannao Wetland Reserve in Shenmu, northwest China's Shaanxi Province, June 3, 2021.Photo:Xinhua

Relict gulls (larus relictus) are seen at the Hongjiannao Wetland Reserve in Shenmu, northwest China's Shaanxi Province, June 3, 2021.Photo:Xinhua

Relict gulls (larus relictus) are seen at the Hongjiannao Wetland Reserve in Shenmu, northwest China's Shaanxi Province, June 3, 2021.Photo:Xinhua

Relict gulls (larus relictus) are seen at the Hongjiannao Wetland Reserve in Shenmu, northwest China's Shaanxi Province, June 3, 2021.Photo:Xinhua

Relict gulls (larus relictus) are seen at the Hongjiannao Wetland Reserve in Shenmu, northwest China's Shaanxi Province, June 3, 2021.Photo:Xinhua

Relict gulls (larus relictus) are seen at the Hongjiannao Wetland Reserve in Shenmu, northwest China's Shaanxi Province, June 3, 2021.Photo:Xinhua