The two rugged granite rock mountain ranges of Wichita Mountains Wildlife Refuge once protected Native Americans from detection by the U.S. Calvary. Since the early 1900s, bison and other endangered species have found refuge within the walls and canyons that enclose its natural plains habitat. Roughly 650 American bison call it home, along with Rocky Mountain elk and white-tailed deer. The refuge also maintains a herd of Texas longhorn cattle to preserve the cultural and historical legacy of the breed.
Photo courtesy of Thinkstock

America’s oldest national park is duly famous as one of the world’s great wildlife meccas. In addition to its large populations of elk, bison, moose, black bear and grizzly bear, the park is perhaps most noted for its gray wolves, reintroduced into the Yellowstone ecosystem in 1995. The wide-open expanse of the Lamar Valley in particular offers the world’s best chance to spot elusive gray wolves in the wild.
Photo courtesy of Neal Herbert / NPS Photo

When Wind Cave National Game Preserve was established in 1912, bison, elk and pronghorn were reintroduced to this region of South Dakota. Today, the national park hosts a range of wildlife, including prairie dog towns, herds of pronghorn antelope, elk and the recently reintroduced black-footed ferret.
Photo courtesy of NPS

The discovery of bald eagles at a former World War II chemical weapons manufacturing site spurred Congress to establish this wildlife refuge in 1992. Today along its 9-mile Wildlife Drive and 10 miles of foot trails, visitors can also spot bison, deer, coyotes, burrowing owls, song birds and other thriving fauna and flora.
Photo courtesy of USFWS

With six million acres of wilderness, it's no surprise that wildlife abounds in Denali National Park. The park's diversity includes 39 species of mammals, 1 lone amphibian and 169 species of birds. Denali's "Big Five" include moose, caribou, Dall sheep, wolves and grizzly bears, though it's also possible to spot collared pika, marmot, red fox, snowshoe hare, wolverine and black bear.
Photo courtesy of NPS Photo/Kent Miller)

You'd have to have your eyes closed to not see wildlife while exploring Rocky Mountain National Park. Of the park's 67 mammal species, it's common to spot elk, yellow-bellied marmot, moose, bighorn sheep, pika and mule deer; rarer but not unheard of are mountain lions, coyotes and black bear.
Photo courtesy of NPS Photo

Fall foliage isn't the only thing to spot along the scenic Blue Ridge Parkway. The elevation along the parkway ranges from 600 to over 6,000 feet, offering habitats to a staggering diversity of animal life – 43 amphibian, 99 fish, 225 bird, 70 mammal and 31 reptile species. Animal sightings might include black bears, river otters, beavers, snapping turtles and wild turkeys.
Photo courtesy of Jenn Deane / Flickr

The towering Teton Range of Grand Teton National Park provides a variety of habitats to area wildlife. Hikers in the high mountains might spot yellow-bellied marmot, black bears or golden eagles, while bison graze along the low-lying plains. Coyotes, moose, pikas, ground squirrels, beavers and river otters number among the 61 species of mammal within the park.
Photo courtesy of D. Lehle / NPS Photo

A hiker's paradise, Glacier National Park also excels in terms of wildlife viewing. A diversity of habitats within park boundaries mean a wide variety of animals live there. The park houses one of the biggest grizzly bear populations in the Lower 48, as well as plentiful elk, mountain goats, ground squirrels and the difficult-to-spot northern bog lemming.
Photo courtesy of NPS / Tim Rains

Alaska's Kodiak National Wildlife Refuge is synonymous with one mammal: the Kodiak brown bear. Along with these genetically distinct brown bears, the refuge protects 400 breeding pairs of bald eagles, salmon, red fox, river otter, ermine, tundra vole and little brown bat, as well as 247 species of birds.
Photo courtesy of Lisa Hupp/USFWS