Shuan Shuan, a 25-year-old female Giant Panda, chews a bamboo leaf given to her through the fence of her enclosure at the Chapultepec Zoo in Mexico City May 30, 2011. Marta Delgado, Mexico's minister of environment, announced today in a news conference that Chinese reproduction specialists will travel to Mexico to inseminate Shuan Shuan and Xin Xin with semen obtained from panda bears in China. [Photo/Agencies]