KHAO YAI, THAILAND - MARCH 18: Cassava (Manihot esculenta), a woody shrub of the spurge family seen near the Khao Yai national park on March 18, 2017 in Khao Yai, Thailand. Cassava is the third-largest source of food carbohydrates in the tropics, after rice and maize. (Photo by Isa Foltin/Getty Images)