While cranes may be the most conspicuous of the waterbirds at Grays Lake, a great many others may also be seen. Franklin's gulls nest in large colonies in bulrush habitat along with a lesser number of white-faced ibis. Grebes, bitterns, and elusive rails are present. Wet meadows, shallow water, and mudflats harbor such shorebirds as curlews, snipe, phalaropes, and willets. Other Wildlife, Large and Small Refuge habitat supports a variety of other migratory birds including eagles, hawks, falcons, and many species of songbirds.
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.