Wildlife is both diverse and plentiful. Black Hills creeks are known for their trout, while the forests and grasslands offer good habitat for American bison, white-tailed and mule deer, pronghorn, bighorn sheep, mountain lions, and a variety of smaller animals, like prairie dogs, American martens, American red squirrels, Northern flying squirrels, yellow-bellied marmots, and fox squirrels. Biologically, the Black Hills is a meeting and mixing place, with species common to regions to the east, west, north, and south. The Hills do, however, support some endemic taxa, the most famous of which is probably white-winged junco (Junco hyemalis aikeni). Some other endemics are Cooper's Rocky Mountain snail, Black Hills subspecies of red-bellied snake, and a Black Hills subspecies of southern red-backed vole. Some birds that are only in the Black Hills and not the rest of South Dakota are pinyon jay, Canada jay, three-toed woodpecker, black-backed woodpecker, American dipper, ruffed grouse, and others.