In southwest China’s Yunnan Province, a rare phenomenon occurred. In the Honghe Butterfly Valley, millions of butterflies emerged. Swarms of butterflies swirled and danced in the mountains and forests, creating a magnificent natural wonder.

According to Yang Zhenwen, director of the butterfly valley museum in Ma’an’di Town, this butterfly explosion is a seasonal event generated in late spring and early summer.

More than 320 butterfly species have been identified in specimens or images, including China’s rarest, most primitive, largest, and smallest butterflies.

Cold temperatures this year delayed the butterfly’s appearance in May, and now is the peak time for butterflies to emerge, which the arrow ring butterfly dominates.

Xinhua quoted Yang saying, “based on the samplings at 23 observation sites in the valley, the total number of butterflies during this year’s explosion will be over 100 million, and the explosion will last until July.”

He added, “there are only two places in the world where butterfly explosions have been observed, one in Mexico and the other in this butterfly valley.”

Why did” Butterfly Outbreak” choose Jinping, Yunnan? 

It is understood that the Maandi Township of Yunnan Province, where the Honghe Butterfly Valley is located, is at the southern extension of Sadao Mountain and belongs to a tropical and subtropical monsoon climate zone. 

Zhou Xuesong, an animal and plant conservation expert, said Ma’an’di is warm and humid all year round. It has a forest coverage rate of 70 percent and an altitude of 3,012 meters (9882 feet), rendering it a complete monsoon evergreen broad-leaved forest replete with other vegetation types.

At the same time, the thick growth of Chinese giant bamboo offers enough food resources for the arrow ring butterfly to maintain a healthy population.

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