Invasive North American Beavers
They were purposely placed in Argentina and Chile, where the Patagonian Andes are located. The Argentine Navy imported 10 beavers from Canada in 1946, setting them free in Tierra Del Fuego (one of the regions of Patagonia). They were hoping that they would enrich the native fauna and the fur industry. Their population was protected from hunting for 35 years so they grew 5,000 times their initial population. They began to advance over the continent.
Their population is declining at a fast rate (Population in HIPPCO) because of overhunting rand loss of habitat due to conversion of lowland areas to agricultural production (Habitat destruction in HIPPCO). The deer are well adapted to the Patagonian rugged and forested mountainous terrain. They are top priority to save from extinction in the Patagonia wildlife.