Around 100 million butterflies will emerge from their cocoons in Jinping County of Yunnan Province later this month. Experts say this will be the largest scale of butterflies arising from the place known as the Butterfly Valley in 10 years. From May to June every year, millions of butterflies break through their cocoons in the valley. Due to relatively high temperatures last year, the butterflies in the valley have matured much faster. In recent years, Jinping County has implemented various measures to ensure ecological diversity in the area.