A flock of great blue herons are seen in Guanshanhu Park in Guiyang, capital of southwest China's Guizhou Province, April 3, 2021. (Xinhua/Liu Xu)
Great blue herons are seen in Guanshanhu Park in Guiyang, capital of southwest China's Guizhou Province, April 3, 2021. (Xinhua/Liu Xu)
Great blue herons are seen in Guanshanhu Park in Guiyang, capital of southwest China's Guizhou Province, April 3, 2021. (Xinhua/Liu Xu)
A flock of great blue herons are seen in Guanshanhu Park in Guiyang, capital of southwest China's Guizhou Province, April 3, 2021. (Xinhua/Liu Xu)
Great blue herons are seen in Guanshanhu Park in Guiyang, capital of southwest China's Guizhou Province, April 3, 2021. (Xinhua/Liu Xu)
A flock of great blue herons are seen in Guanshanhu Park in Guiyang, capital of southwest China's Guizhou Province, April 3, 2021. (Xinhua/Liu Xu)