Aerial photo taken on July 5, 2018 shows egrets resting at the Dahantang Reservoir in Lujiang County, east China's Anhui Province. The 20-hectare reservoir is a habitat for thousands of egrets. (Xinhua/Guo Chen)

Aerial photo taken on July 5, 2018 shows egrets resting at the Dahantang Reservoir in Lujiang County, east China's Anhui Province. The 20-hectare reservoir is a habitat for thousands of egrets. (Xinhua/Guo Chen)

Aerial photo taken on July 5, 2018 shows egrets resting at the Dahantang Reservoir in Lujiang County, east China's Anhui Province. The 20-hectare reservoir is a habitat for thousands of egrets. (Xinhua/Guo Chen)

Aerial photo taken on July 5, 2018 shows egrets resting at the Dahantang Reservoir in Lujiang County, east China's Anhui Province. The 20-hectare reservoir is a habitat for thousands of egrets. (Xinhua/Guo Chen)

Aerial photo taken on July 5, 2018 shows egrets resting at the Dahantang Reservoir in Lujiang County, east China's Anhui Province. The 20-hectare reservoir is a habitat for thousands of egrets. (Xinhua/Guo Chen)

Aerial photo taken on July 5, 2018 shows egrets resting at the Dahantang Reservoir in Lujiang County, east China's Anhui Province. The 20-hectare reservoir is a habitat for thousands of egrets. (Xinhua/Guo Chen)

Aerial photo taken on July 5, 2018 shows egrets resting at the Dahantang Reservoir in Lujiang County, east China's Anhui Province. The 20-hectare reservoir is a habitat for thousands of egrets. (Xinhua/Guo Chen)

Aerial photo taken on July 5, 2018 shows egrets resting at the Dahantang Reservoir in Lujiang County, east China's Anhui Province. The 20-hectare reservoir is a habitat for thousands of egrets. (Xinhua/Guo Chen)

Aerial photo taken on July 5, 2018 shows egrets resting at the Dahantang Reservoir in Lujiang County, east China's Anhui Province. The 20-hectare reservoir is a habitat for thousands of egrets. (Xinhua/Guo Chen)

(Compiled by Terry Guanlin Li)