In pics: black storks at Mianman River in north China's Hebei

Black storks frolic at Mianman River in Jingxing County, north China's Hebei Province, Dec. 22, 2022. Black stork is a migratory bird species under first-class national protection in China. There are fewer than 1,000 remaining in East Asia. (Xinhua/Yang Shiyao)

Black storks forage at Mianman River in Jingxing County, north China's Hebei Province, Dec. 22, 2022. Black stork is a migratory bird species under first-class national protection in China. There are fewer than 1,000 remaining in East Asia. (Xinhua/Yang Shiyao)

Black storks forage at Mianman River in Jingxing County, north China's Hebei Province, Dec. 22, 2022. Black stork is a migratory bird species under first-class national protection in China. There are fewer than 1,000 remaining in East Asia. (Xinhua/Yang Shiyao)

Black storks forage at Mianman River in Jingxing County, north China's Hebei Province, Dec. 22, 2022. Black stork is a migratory bird species under first-class national protection in China. There are fewer than 1,000 remaining in East Asia. (Xinhua/Yang Shiyao)

Black storks fly above Mianman River in Jingxing County, north China's Hebei Province, Dec. 22, 2022. Black stork is a migratory bird species under first-class national protection in China. There are fewer than 1,000 remaining in East Asia. (Xinhua/Yang Shiyao)

Black storks forage at Mianman River in Jingxing County, north China's Hebei Province, Dec. 22, 2022. Black stork is a migratory bird species under first-class national protection in China. There are fewer than 1,000 remaining in East Asia. (Xinhua/Yang Shiyao)

Black storks frolic at Mianman River in Jingxing County, north China's Hebei Province, Dec. 22, 2022. Black stork is a migratory bird species under first-class national protection in China. There are fewer than 1,000 remaining in East Asia. (Xinhua/Yang Shiyao)

Black storks rest on stones by Mianman River in Jingxing County, north China's Hebei Province, Dec. 22, 2022. Black stork is a migratory bird species under first-class national protection in China. There are fewer than 1,000 remaining in East Asia. (Xinhua/Yang Shiyao)

Black storks forage at Mianman River in Jingxing County, north China's Hebei Province, Dec. 22, 2022. Black stork is a migratory bird species under first-class national protection in China. There are fewer than 1,000 remaining in East Asia. (Xinhua/Yang Shiyao)