Since the establishment of the National Park Service in 1916, it has become increasingly obvious that the occupation of the national parks by man and wildlife must inevitably result in wildlife problems. The act creating the National Park Service is specific in its language; it says that the Service thus established shall promote and regulate the use of the areas by such means and measures necessary “to conserve the scenery and the natural and historic objects and the wildlife therein and to provide for the enjoyment of the same in such manner and by such means as will leave them unimpaired for the enjoyment of future generations.” The apparent inconsistency presents itself immediately. Natural features must be conserved and protected, they must not be impaired, yet provision must be made for their enjoyment by the millions of visitors who come to the national parks each year. The course that must be followed, then, is one of permitting modification of the natural scene only to the degree required to provide for perpetual enjoyment of “the scenery, the natural and historic objects and the wildlife.” The relations between man and the wildlife of the national parks are complex. Both occupy the parks, with equal rights to that occupancy. It can scarcely be argued that man is not a part of the natural scene; certainly there is nothing essentially unnatural in the progress of our civilization from the dawn of history to the present. In the national parks, however, the _unimpaired_ values to be preserved are those of the _primitive natural scene_. Man can strive to maintain these values, unimpaired, because he has the power of reason. Through that power he can recognize the effect of his conflict with nature, and so prevent the destruction of the primitive natural scene by a proper regulation of his acts. Specifically, the wildlife problems now readily recognized in Mount Rainier National Park are those which have developed because of relations between man and mammals. The deer, bear, and raccoon are outstanding examples. In the developed areas of the park many of these animals have become so accustomed to the proximity of man that they no longer exhibit timidity in his presence. They are essentially “wild” animals, yet because of close association with man for several wildlife generations, they may be practically considered as “semi-domestic” animals.