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Juvenile alligator in swampland (bayou) at Jean Lafitte National Historical Park and Preserve, south of New Orleans, Louisiana, USA

Mount McKinley (Mount Denali) at sunset in the fall, Denali National Park and Preserve, Alaska, United States of America

Mount McKinley with tundra in fall color, Denali National Park and Preserve, Alaska, United States of America, North America

Grizzly bear (Ursus arctos horribilis) (Coastal brown bear) on a road with fall color, Denali National Park and Preserve, Alaska, United States of America, North America

Hikers in front of Lamplugh Glacier, Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Alaska, United States of America, North America

Porcupine caribou (Grant's caribou) (Rangifer tarandus granti) cow among fall colors, Denali National Park and Preserve, Alaska, United States of America, North America

Orange brown beech tree with autumn leaves, Savernake Forest, Wiltshire, England, United Kingdom, Europe

Johns Hopkins Inlet, Fairweather Range, Glacier Bay National Park and Preserve, Southeast Alaska, United States of America, North America

Mount McKinley (Mount Denali), Denali National Park and Preserve, Alaska, United States of America, North America

Information panel about geology, La Isleta, Cabo de Gata national park, Almeria, Andalusia, Spain, Europe

Mount McKinley reflected in a pond, Denali National Park and Preserve, Alaska, United States of America, North America

A kayaker paddling in front of Lamplugh Glacier, Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Alaska, United States of America, North America

North American elk (Cervus Elaphus) and sand dunes, Great Sand Dunes National Park and Preserve, Sangre Cristo Mountains in background, Colorado, United States of America, North America

Monument of Agonothetes (Bouleuterion), Roman 2nd century AD, Apollonia Archaeological Park, Pojan, Albania, Europe

Mount McKinley (Mount Denali), Denali National Park and Preserve, Alaska, United States of America, North America

Mountains and a stream through the tundra in fall color, Denali National Park and Preserve, Alaska, United States of America, North America

Mountains and tundra in fall color, Denali National Park and Preserve, Alaska, United States of America, North America

Red fox (Vulpes vulpes) (Vulpes fulva), Denali National Park and Preserve, Alaska, United States of America, North America

Hiker on the sand dunes, Great Sand Dunes National Park and Preserve, with Sangre Cristo Mountains in the background, Colorado, United States of America, North America

Johns Hopkins Glacier calving, Fairweather Range, Glacier Bay National Park and Preserve, Southeast Alaska, United States of America, North America

Sand dunes, Great Sand Dunes National Park and Preserve, with Sangre Cristo Mountains in the background, Colorado, United States of America, North America

Red squirrel (spruce squirrel) (Tamiasciurus hudsonicus), Denali National Park and Preserve, Alaska, United States of America

Sand dunes in the Great Sand Dunes National Park and Preserve, with Sangre Cristo Mountains in the background, Colorado, United States of America, North America

Hikers on the sand dunes, Great Sand Dunes National Park and Preserve, with Sangre Cristo Mountains in the background, Colorado, United States of America, North America

Young beaver (Castor canadensis) swimming, Denali National Park and Preserve, Alaska, United States of America, North America

Johns Hopkins Inlet, Fairweather Range, Glacier Bay National Park and Preserve, Southeast Alaska, United States of America, North America

Grizzly bear (Ursus arctos horribilis) (Coastal brown bear) dripping wet while fishing, Katmai National Park and Preserve, Alaska, United States of America, North America

Willow Ptarmigan (Lagopus lagopus), Katmai National Park and Preserve, Alaska, United States of America, North America

Great Sand Dunes and mountains with snow, Great Sand Dunes National Park and Preserve, Colorado, United States of America, North America

Tundra in fall colors, Denali National Park and Preserve, Alaska, United States of America, North America

Johns Hopkins Inlet, Fairweather Range, Glacier Bay National Park and Preserve, Southeast Alaska, United States of America, North America

Johns Hopkins Glacier calving, Fairweather Range, Glacier Bay National Park and Preserve, Southeast Alaska, United States of America, North America

Great Sand Dunes and mountains with snow, Great Sand Dunes National Park and Preserve, Colorado, United States of America, North America

Beaver (Castor canadensis) swimming, Denali National Park and Preserve, Alaska, United States of America, North America

Sand dunes, Great Sand Dunes National Park and Preserve, Colorado, United States of America, North America

Great Sand Dunes late in the afternoon, Great Sand Dunes National Park and Preserve, Colorado, United States of America, North America

Solitary sandpiper (Tringa solitaria), Katmai National Park and Preserve, Alaska, United States of America, North America

Alaskan brown bear (Ursus middendorffi), Katmai National Park and Preserve, Alaska, 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

Tall hoodoo towers in the valley below Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America

East slopes of Haystack Mesa in Petrified Forest National Park, Arizona, United States of America, North America

Juvenile Dall Sheep (Ovis dalli) and lamb among fall color, Denali National Park and Preserve, Alaska, United States of America, North America

Grizzly bear (Ursus arctos horribilis) (Coastal brown bear) walking in a stream, Katmai National Park and Preserve, Alaska, United States of America, North America

A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

View of the Polychrome Mountains from lookout point on the park road inside Denali National Park and Preserve, Alaska, United States of America

View of the Polychrome Mountains from lookout point on the park road inside Denali National Park and Preserve, Alaska, United States of America

View of the Polychrome Mountains from lookout point on the park road inside Denali National Park and Preserve, Alaska, United States of America

View of the Polychrome Mountains from lookout point on the park road inside Denali National Park and Preserve, Alaska, United States of America

Lamplugh Glacier, a tidewater glacier in Glacier Bay National Park and Preserve, Southeast Alaska, United States of America, North America

Sandstone that has been eroded into forms that resemble clam shells on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A view of South Marble Island in Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

The Little Teepees on the north side of Haystack Mesa in Petrified Forest National Park, Arizona, United States of America, North America

A close up view of Lamplugh Glacier in Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

A view in Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Scenic view of Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Southeast Alaska, Pacific Ocean, United States of America, North America

Garibaldi refuge in Adamello Park in summer, Vallecamonica, Brescia province, Lombardy district, Italy, Europe

The Little Teepees on the north side of Haystack Mesa in Petrified Forest National Park, Arizona, United States of America, North America

Scenic view of Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Southeast Alaska, Pacific Ocean, 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

A view of Margerie Glacier against the Fairweather Range in Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Alaska, United States of America, North America

Beaver (Castor canadensis) swimming with food, Denali National Park and Preserve, Alaska, United States of America, North America

Snow-capped mountains and tundra in fall color, Denali National Park and Preserve, Alaska, United States of America, North America

Grizzly bear (Ursus horribilis) in the fall, Denali National Park and Preserve, Alaska, United States of America, North America

A view of Johns Hopkins Glacier against the Fairweather Range in Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Alaska, United States of America, North America

Crystal Mesa above Crystal Creek west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

A view of Tarr Inlet in Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Grizzly bear (Ursus arctos horribilis) (Coastal brown bear), Katmai National Park and Preserve, Alaska, United States of America, North America

An adult brown bear (Ursus arctos) fishing for salmon at Brooks Falls, Katmai National Park and Preserve, Alaska, United States of America, North America

Mount Foraker in the fall, Denali National Park and Preserve, Alaska, United States of America, North America

Crescent Lake, Lake Clark National Park and Preserve, Alaska, United States of America, North America

An island of rock just off the Billings Gap Trail at Petrified Forest National Park, Arizona, United States of America, North America

Grizzly bear (brown bear) (Ursus arctos) at Crescent Lake, Lake Clark National Park and Preserve, Alaska, United States of America, North America

Mount Redoubt and Crescent Lake, Lake Clark National Park and Preserve, Alaska, United States of America, North America

Beaver (Castor canadensis) hauling a log up over its dam, Denali National Park and Preserve, Alaska, United States of America

Grizzly (brown) bear (Ursus arctos) at Crescent Lake, Lake Clark National Park and Preserve, Alaska, United States of America, North America

Beaver (Castor canadensis) swimming, Denali National Park and Preserve, Alaska, United States of America, North America

Adult brown bears (Ursus arctos) fishing for salmon at Brooks Falls, Katmai National Park and Preserve, Alaska, United States of America, North America

Stranded ice on the low tide in front of Lamplugh Glacier, Glacier Bay National Park and Preserve, Alaska, United States of America, North America

A mother brown bear (Ursus arctos) with her cubs on the beach in Lake Clark National Park and Preserve, Alaska, United States of America, North America

A pointed peak of bentonite in Hamilili Valley on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Grizzly bear (Ursus arctos horribilis) (Coastal brown bear) eating a salmon, Katmai National Park and Preserve, Alaska, United States of America, North America

Stranded ice on the low tide in front of Lamplugh Glacier, Glacier Bay National Park and Preserve, Alaska, United States of America, North America

Red squirrel (spruce squirrel) (Tamiasciurus hudsonicus) in a spruce tree, Denali National Park and Preserve, Alaska, United States of America, North America

Mount McKinley in the fall, Denali National Park and Preserve, Alaska, United States of America, North America