Photo taken on April 18, 2019 shows a squirrel at the Bosque de Chapultepec park in Mexico City, Mexico. The Bosque de Chapultepec park, located on the top of the Chapultepec mountain with an altitude of over 2,000 meters, covers an area of 686 hectares. As a major urban park, it is also the cultural center of Mexico City. (Xinhua/Xin Yuewei)