Assorted mammals are also present at Grays Lake. Moose, elk, and mule deer use the refuge and are common throughout the area. Smaller mammals regularly seen include muskrats, ground squirrels, and badgers. Visitor use is relatively light. Wildlife observation and photography are the principal non-consumptive activities.
Waterfowl hunting is permitted in designated areas.
Visitor access is seasonally limited to avoid disturbance to sensitive wildlife. At times, however, large portions of the refuge are closed to public entry to minimize disturbance to wildlife. The overlook adjacent to Refuge Headquarters is open to the public May 1 through November 15. This site is a good point to get an expansive look at the refuge and a distant view of wildlife. Binoculars and spotting scopes are recommended.