 It was introduced to Guam by Mariano Tobias sometime around 1771 to 1772 to be used in recreational hunting.The deer subsequently populated other neighboring locales in Micronesia, including the islands of Rota, Saipan and Pohnpei.However, in the absence of a natural predator, its population is rapidly expanding in Guam, posing serious threats to the native ecosystem and agricultural lands due to overgrazing.