For several years I have been accumulating bones and shells picked up on the surface and excavated from the eroding west face of Sleeping Bear sand dune, Leelanau County, Michigan. The known history, the legend, and the ecology of Sleeping Bear have been recorded by F. C. Gates (1950). Previously, David Gates (1939) had reported on a collection of bones from this site. He identified five kinds of mammals: red fox (Vulpes fulva), marten (Martes americana), woodchuck (Marmota monax), snowshoe hare (Lepus americanus), and elk (Cervus canadensis). I have specimens of twenty-one kinds of native mammals, including all those noted by Gates.