Photo taken on Oct. 11, 2020 shows the venus flytrap in Shanghai Botanical Garden in east China's Shanghai. More than 250 varieties of insectivorous plants are on display during the 2nd Insectivorous Plant Exhibition. (Xinhua/Zhang Jiansong)

Tourists view an insectivorous plant in Shanghai Botanical Garden in east China's Shanghai, Oct. 11, 2020. More than 250 varieties of insectivorous plants are on display during the 2nd Insectivorous Plant Exhibition. (Xinhua/Zhang Jiansong)

Tourists view an insectivorous plant in Shanghai Botanical Garden in east China's Shanghai, Oct. 11, 2020. More than 250 varieties of insectivorous plants are on display during the 2nd Insectivorous Plant Exhibition. (Xinhua/Zhang Jiansong)

Tourists view an insectivorous plant in Shanghai Botanical Garden in east China's Shanghai, Oct. 11, 2020. More than 250 varieties of insectivorous plants are on display during the 2nd Insectivorous Plant Exhibition. (Xinhua/Zhang Jiansong)

Photo taken on Oct. 11, 2020 shows the pitcher plant in Shanghai Botanical Garden in east China's Shanghai. More than 250 varieties of insectivorous plants are on display during the 2nd Insectivorous Plant Exhibition. (Xinhua/Zhang Jiansong)

Photo taken on Oct. 11, 2020 shows the pitcher plant in Shanghai Botanical Garden in east China's Shanghai. More than 250 varieties of insectivorous plants are on display during the 2nd Insectivorous Plant Exhibition. (Xinhua/Zhang Jiansong)