What Triggered the Asian Elephant's Northward Migration Across Southwestern Yunnan?

Migration routes of the Asian elephants and the related climate and vegetation changes
The Asian elephant (Elephas maximus), an endangered species on the International Union for Conservation of Nature Red List, is the largest terrestrial animal living in Asia. They require a relatively large space to live in. In China, the wild Asian elephants exist only in XiShuangBanNa, Pu’Er, and LinCang of southern Yunnan Province, with 95% of the wild population residing in the XiShuangBanNa National Nature Reserve. In recent years, territorial conflicts have arisen between humans and elephants around the national nature reserve.
