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Loop Drive, Three Sisters on left, Camel Butte on right, Monument Valley Navajo Tribal Park, Utah, United States of America

Scenic view from Tracy Arm-Fords Terror Wilderness area in Southeast Alaska, United States of America

Adult brown bears (Ursus arctos) feeding on humpback whale carcass, Scidmore Cut, Glacier Bay National Park, Alaska, United States of America

Adult brown bears (Ursus arctos) feeding on humpback whale carcass, Scidmore Cut, Glacier Bay National Park, Alaska, United States of America

Adult brown bears (Ursus arctos) and wolf (Canis lupus) feeding on humpback whale carcass in Glacier Bay National Park, Alaska, United States of America

Adult brown bear pair (Ursus arctos) exhibiting courtship behavior at Scidmore Cut in Glacier Bay National Park, Alaska, United States of America

Adult brown bear pair (Ursus arctos) mock-fighting at Scidmore Cut in Glacier Bay National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) feeding on humpback whale carcass in Glacier Bay National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) feeding on humpback whale carcass in Glacier Bay National Park, Alaska, United States of America

Adult brown bear pair (Ursus arctos) mock-fighting at Scidmore Cut in Glacier Bay National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) shaking water from its fur near whale carcass in Glacier Bay National Park, Alaska, United States of America

A small pod of killer whales (Orcinus orca) encountered in Glacier Bay National Park, Southeast Alaska, United States of America

Adult snowshoe hare (Lepus americanus dalli) in Denali National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bears (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

View from Park Service platform where adult brown bears (Ursus arctos) forage for salmon, Katmai National Park, Alaska, United States of America

Adult brown bears (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

View from Park Service platform where adult brown bears (Ursus arctos) forage for salmon, Katmai National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Great blue heron (Ardea herodias), standing alert beside trail in Shark Valley, Everglades National Park, Florida, United States of America, North America

Old water pipe, Johnson Canyon between Bainbridge Steel and Stone Dams near Ash Fork, Kaibab National Forest, Arizona, United States of America

Wrangell-St. Elias National Park landscape from the Willow Lake, UNESCO World Heritage Site, Alaska, United States of America, North America

Reflection Lake, Mount Rainier National Park, Washington State, United States of America, North America

Pretty scenic views in Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Rainbow Geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

View down Zion Canyon from Angels Landing, Zion National Park, Utah, United States of America, North America

Mountain view at sunset, Mount Rainier National Park, Washington State, United States of America, North America

Grand Canyon view just below the summit of Buggeln Hill on the South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Mounds and cliffs of expansive clay called Bentonite in the Jasper Forest of Petrified Forest National Park, Arizona, United States of America, North America

A large petrified log along the Blue Mesa Trail in Petrified Forest National Park, Arizona, United States of America, North America

Panorama view of the Painted Desert from Tawa Point in Petrified Forest National Park, Arizona, United States of America, North America

Giant redwoods on the Lady Bird Johnson Trail in Redwood National Park, California, United States of America, North America

Caution sign on the Lady Bird Johnson Trail in Redwood National Park, UNESCO World Heritage Site, California, United States of America, North America

View along the Virgin River from Canyon Junction, autumn, golden cottonwood trees prominent, Zion National Park, Utah, United States of America, North America

Fall color change amongst the trees and shrubs on the Rock Creek Trail in Denali National Park, Alaska, United States of America, North America

Hills of blood red bentonite clay below Kachina Point in Petrified Forest National Park, Arizona, United States of America, North America

Hoodoo formations in the Devil's Playground in Petrified Forest National Park, Arizona, United States of America, North America

A long exposure captures the beautiful landscape in Bryce Canyon National Park during a summer sunrise, Utah, United States of America, North America

Elk (Cervus canadensis) in Rocky Mountain National Park, Colorado, United States of America, North America

The paved trail that leads to the historic Agate House in Petrified Forest National Park, Arizona, United States of America, North America

Closeup of the historic Agate House in Petrified Forest National Park, Arizona, United States of America, North America

A warning sign to stay on the trail to the historic Agate House in Petrified Forest National Park, Arizona, United States of America, North America

Purple badlands of bentonite near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

The sun shade shelter along the Long Logs Trail at Petrified Forest National Park, Arizona, United States of America, North America

View of a bentonite hill along the Long Logs Trail in Petrified Forest National Park, Arizona, United States of America, North America

A cliff overhang shaped like the head of a Duck west of Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Small mesas with flat tops called Rock Islands on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A ridge of gray bentonite viewed from a nearby flat top mesa on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A narrow slot canyon of bentonite on the south end of Petrified Forest National Park, Arizona, United States of America, North America

An adult yellow-bellied marmot (Marmota flaviventris), in Yellowstone National Park, Wyoming, United States of America, North America

A woman strolls along the ridge of a pure white sand dune in White Sands National Park, New Mexico, United States of America, North America

Lower Falls, Yellowstone River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Volcanic landscape, Hawaii silversword (Argyroxiphium sandwicense) endemic, Haleakala National Park, Maui Island, Hawaii, United States of America, North America

Haleakala National Park, view of west Maui, Maui Island, Hawaii, United States of America, North America

Haleakala National Park, volcanic landscape, Maui Island, Hawaii, United States of America, North America

Haleakala National Park, volcanic landscape, Maui Island, Hawaii, United States of America, North America

Valley with colourful foliage in the Indian summer, Great Smoky Mountains National Park, UNESCO World Heritage Site, Tennessee, United States of America, North America

Bryce Canyon at dawn, from Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

A view of Tlingit eagle carving at Bartlett Cove in Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Downward view from the second floor in historic Desert View Watchtower at Grand Canyon South Rim, artwork created by Fred Kobotie in 1933, now owned by the National Park Service, UNESCO World Heritage Site, Arizona, United States of America, North America

Adult bull killer whale (Orcinus orca) surfacing in Glacier Bay National Park, Southeast Alaska, United States of America, Pacific Ocean, North America

The Colorado River makes a huge S-bend under Deadhorse Point, a famous viewpoint across Canyonlands National Park, near Moab, Utah, United States of America, North America

Cliff views south of Naji Point on the North Rim of Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

American Bison (Bison Bison) walking in the snow in the Badlands, Badlands National Park, South Dakota, United States of America, North America

Close up view of canyon through Mesa Arch at sunrise, Canyonlands National Park, Utah, United States of America, North America

Zion valley seen from Watchman trail, Zion National Park, Utah, United States of America, North America

Bryce Canyon amphitheater at sunset, Inspiration Point, Bryce Canyon National Park, Utah, United States of America, North America

Natural rock formations at Zabriskie Point, Death Valley National Park, Eastern California, California, United States of America, North America

Tourists exploring colorful rocks at Artist's Palette, Death Valley National Park, Eastern California, California, United States of America, North America

Bryce Canyon amphitheater, Inspiration Point, Bryce Canyon National Park, Utah, United States of America, North America

Tourists entering natural arch while hiking Queens Garden Trail, Bryce Canyon National Park, Utah, United States of America, North America

Scenic view of hoodoos and rock formations, Rim Trail near Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Hoodoos in Bryce Canyon amphitheater at sunrise, Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

Bryce Canyon amphitheater at sunset, Bryce Point, Bryce Canyon National Park, Utah, United States of America, North America

Scenic view of hoodoos and rock formations from Queens Garden Trail near Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Scenic view of hoodoos and rock formations from Queens Garden Trail near Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Scenic view of hoodoos and rock formations, Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Scenic view of hoodoos and rock formations, Rim Trail, Bryce Canyon National Park, Utah, United States of America, North America

Fruita Barn, Capitol Reef National Park, Utah, Western United States, United States of America, North America

Grand Canyon, near Grandview Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon, Pima Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon, Maricopa Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon, Powell Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon, Mohave Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

A shallow cave carved out of a cliff wall below the Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America

American dipper (water ouzel) (Cinclus mexicanus) standing on ice, Yellowstone National Park, Wyoming, United States of America, North America