Many sand martins, a species of swallow, nest in the loess in downtown Zhengzhou City, the capital of Central China's Henan Province, April 24, 2018. Conservationists have called for locals to protect the birds. (Photo/VCG)
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Many sand martins, a species of swallow, nest in the loess in downtown Zhengzhou City, the capital of Central China's Henan Province, April 24, 2018. Conservationists have called for locals to protect the birds. (Photo/VCG)
