A man rides on an elephant during the Elephant Festival in a tributary of Mekong River in northern Lao province of Xayaboury, on Feb. 22, 2020. The annual Elephant Festival lasts from Feb. 22 to Feb. 28 this year. (Photo by Kaikeo Saiyasane/Xinhua)

People ride on elephants during the Elephant Festival in a tributary of Mekong River in northern Lao province of Xayaboury, on Feb. 22, 2020. The annual Elephant Festival lasts from Feb. 22 to Feb. 28 this year. (Photo by Kaikeo Saiyasane/Xinhua)

Kids play with elephants during the Elephant Festival in a tributary of Mekong River in northern Lao province of Xayaboury, on Feb. 22, 2020. The annual Elephant Festival lasts from Feb. 22 to Feb. 28 this year. (Photo by Kaikeo Saiyasane/Xinhua)

A man rides on an elephant during the Elephant Festival in a tributary of Mekong River in northern Lao province of Xayaboury, on Feb. 22, 2020. The annual Elephant Festival lasts from Feb. 22 to Feb. 28 this year. (Photo by Kaikeo Saiyasane/Xinhua)

A man rides on an elephant during the Elephant Festival in a tributary of Mekong River in northern Lao province of Xayaboury, on Feb. 22, 2020. The annual Elephant Festival lasts from Feb. 22 to Feb. 28 this year. (Photo by Kaikeo Saiyasane/Xinhua)

A man rides on an elephant during the Elephant Festival in a tributary of Mekong River in northern Lao province of Xayaboury, on Feb. 22, 2020. The annual Elephant Festival lasts from Feb. 22 to Feb. 28 this year. (Photo by Kaikeo Saiyasane/Xinhua)