Grey herons photographed in Guiyang
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Flocks of grey herons are photographed making nests in a forest in Guiyang, capital of Southwest China's Guizhou province, on April 20. (Photo: VCG)

Flocks of grey herons are photographed making nests in a forest in Guiyang, capital of Southwest China's Guizhou province, on April 20. (Photo: VCG)

Flocks of grey herons are photographed making nests in a forest in Guiyang, capital of Southwest China's Guizhou province, on April 20. (Photo: VCG)