The visitor to Quetico will find a primeval wilderness of limitless forests, mirror-smooth lakes, and innumerable bogs, all supporting a rich variety of plants and animals. The northern forest is mainly black spruce, jack pine, trembling aspen and white birch, with sheltered pockets of more southern trees such as oak, elm, silver maple, yellow birch and basswood. The park also has magnificent stands of red and white pine. Red squirrels, chipmunks, beaver and mink are among the smaller mammals. Larger species such as wolf, bear and moose also live here, and in summer more than 90 species of birds nest in the park. The park is home to one of the largest concentrations of indian pictographs in North America.