In order to make Anticosti Island a hunter's paradise, several animal species have been introduced since 1896, making the island an unprecedented biological experiment. In all, sixteen new species have been introduced, but six proved to be unsuccessful, including bison, caribou, elk, mink and fisher. For ten species it has been fruitful: six species of terrestrial mammals (such as white-tailed deer, moose, beaver, snowshoe hare and muskrat), two species of frogs, and two species of non-migratory birds (ruffed grouse and the spruce grouse). Of all these species introduced, the success of white-tailed deer is particular noteworthy. From an initial group of about 200 introduced in 1896 and 1897, the population of white-tailed deer has grown to an estimated 160,000 animals today, representing a density of 20 deer/km2.