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Gray wolf (Canis lupus) howling, in captivity, Minnesota Wildlife Connection, Minnesota, United States of America, North America

Gray wolf (Canis lupus) on a rock, howling, in captivity, Sandstone, Minnesota, United States of America, North America

The Illercillewaet River valley and the Sir Donald Range of the Selkirk Mountains, Glacier National Park, British Columbia (B.C.), Canada, North America

Spectacular limestone outcrops and forested valleys of Zhangjiajie Forest Park in the Wulingyuan Scenic Area, Hunan Province, China

Spectacular limestone outcrops and forested valleys of Zhangjiajie Forest Park in the Wulingyuan Scenic Area, Hunan Province, China

View across Nymph Lake at sunrise, with Hallett Peak above the trees, Rocky Mountain National Park, Colorado, United States of America, North America

Silhouette of pine tree, White Cloud scenic area, Huang Shan (Mount Huangshan) (Yellow Mountain), UNESCO World Heritage Site, Anhui Province, China, Asia

Backpackers in steamy light, Queets Vall, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America (U.S.A.), North America

Huge waterfall on the bottom of Franz-Joseph Glacier, Westland Tai Poutini National Park, Southern Alps, UNESCO World Heritage Site, South Island, New Zealand, Pacific

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

Irrigation channel carrying water, Huebro, Sierra Alhamilla mountains, Nijar, Almeria, Andalusia, Spain, Europe

View of the Christ statue (Cristo Redactor) on Corcovado with Tijuca National Park behind, Rio de Janeiro, Brazil, South America

The rugged peak of Aonach Dubh reflected in Torren Lochan, Glencoe, Argyll and Bute, Scotland, United Kingdom, Europe

Stream through wildflowers, Mineral Basin, Uncompahgre National Forest, Colorado, United States of America, North America

Rocky River Plym near Shaugh Prior in Dartmoor National Park, Devon, England, United Kingdom, Europe

The magnificent and mysterious Wistmans Wood Nature Reserve in Dartmoor National Park, Devon, England, United Kingdom, Europe

Stream rushing through a lush green mossy wood in Dartmoor National Park, Devon, England, United Kingdom, Europe

Walkers crossing stepping stones over a cascading stream in Tollymore Forest Park, County Down, Ulster, Northern Ireland, United Kingdom, Europe

River Coupall and Buachaille Etive Mor in the autumn, Glen Etive, Highlands, Scotland, United Kingdom, Europe

Tarr Steps clapper bridge in Autumn, Exmoor National Park, Somerset, England, United Kingdom, Europe

Autumn at Tarr Steps on the River Barle, Exmoor National Park, Somerset, England, United Kingdom, United Kingdom, Europe

A couple in a giant love heart lock, Zhangjiajie Forest Park, Wulingyuan Scenic Area, UNESCO World Heritage Site, Hunan Province, China, Asia

Karst limestone rock formations at Zhangjiajie Forest Park, Wulingyuan Scenic Area, UNESCO World Heritage Site, Hunan Province, China, Asia

Hikers on Pipiwai trail in bamboo forest, Haleakala National Park, Maui Island, Hawaii, United States of America, North America

Seventy Islands (Ngerukewid Islands Wildlife Preserve), forest-covered limestone rock, protected as a Nature Reserve, so can only be seen from the air, Palau, Micronesia, Western Pacific Ocean, Pacific

Seventy Islands (Ngerukewid Islands Wildlife Preserve), forest-covered limestone rock, protected as a Nature Reserve, so can only be seen from the air, Palau, Micronesia, Western Pacific Ocean, Pacific

Seventy Islands (Ngerukewid Islands Wildlife Preserve), forest-covered limestone rock, protected as a Nature Reserve, so can only be seen from the air, Palau, Micronesia, Western Pacific Ocean, Pacific

Gavanovac Lake and Milanovac Lake, Plitvice Lakes National Park, UNESCO World Heritage Site, Croatia, Europe

Sokehs Rock, Pohnpei (Ponape), Federated States of Micronesia, Caroline Islands, Central Pacific, Pacific

Sokehs Rock, Pohnpei (Ponape), Federated States of Micronesia, Caroline Islands, Central Pacific, Pacific

Petrified Forest National Park, Blue Mesa, Blue Mesa Trail, sedimentary layers of bluish bentonite clay

Sedimentary layers of bluish bentonite clay with petrified wood, Blue Mesa Trail, Blue Mesa, Petrified Forest National Park, Arizona, United States of America, North America

Sedimentary layers of bluish bentonite clay, The Tepees, Petrified Forest National Park, Arizona, United States of America, North America

Sedimentary layers of bluish bentonite clay, Blue Mesa Trail, Blue Mesa, Petrified Forest National Park, Arizona, United States of America, North America

Quiver trees (Aloe Dichotoma), also referred to as Kokerboom, in the Quivertree Forest on Farm Gariganus near Keetmanshopp, Namibia, Africa

Quiver trees (Aloe Dichotoma), also referred to as Kokerboom, in the Quivertree Forest on Farm Gariganus near Keetmanshopp, Namibia, Africa

Quiver trees (Aloe Dichotoma), also referred to as Kokerboom, in the Quivertree Forest on Farm Gariganus near Keetmanshopp, Namibia, Africa

Early morning vista of Peyto Lake in the Canadian Rockies, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Surrounded by forest and mountains the fast flowing Mistaya River runs alongside the Icefields Parkway in the Canadian Rockies, Alberta, Canada, North America

Snow-melt waterfall in Tracy Arm-Ford's Terror Wilderness area, Southeast Alaska, United States of America, North America

View west from Area Recreativa El Alcazar, Sierra Tejeda Natural Park, Alcaucin, Axarquia, Andalusia, Spain, Europe

Rocky River Tawe in the moorland of forest Fawr (Great Forest), Brecon Beacons National Park, Powys, Wales, United Kingdom, Europe

Waterfall San Vincente in an area of jungle called Mashpi Cloud Forest in the Choco Rainforest, Ecuador, South America

Rock formation at the 50 million year old Stone Forest (Pobiti Kamani), protected national monument, in Varna Province, Bulgaria, Europe

Rock formation at the 50 million year old Stone Forest (Pobiti Kamani), protected national monument, in Varna Province, Bulgaria, Europe

Rock formation at the 50 million year old Stone Forest (Pobiti Kamani), protected national monument, in Varna Province, Bulgaria, Europe

Johnston Canyon Creek, Banff National Park, Alberta, UNESCO World Heritage Site, Canada, North America

The rocky River Teign near Fingle Bridge in autumn, Dartmoor National Park, Devon, England, United Kingdom, Europe

The rocky River Teign near Fingle Bridge in autumn, Dartmoor National Park, Devon, England, United Kingdom, Europe

Yosemite Valley from Tunnel View viewpoint, with El Capitan, a 3000 feet granite monolith on the left, and the Bridalveil Falls on the right, Yosemite National Park, UNESCO World Heritage Site, Sierra Nevada, California, United States of America, North America

Evergreens, red maples, and red rock on the Emerald Pools Trail, Zion National Park, Utah, United States of America, North America

The crystal clear water of the Voidomatis River reflects the vibrant Spring greens in the Vikos Gorge, Zagoria, Epirus, Greece, Europe

Little Rawana (Ravana) Falls en route to Ella Rock, the upper level of the popular falls in Ella Gap below, Ella, Sri Lanka, Asia

Twisted trees overhang a rocky Badgworthy Water in the Doone Valley, Exmoor, Somerset, England, United Kingdom, Europe

River Plym plunges past moss covered boulders on its course through Dewerstone Wood, Dartmoor, Devon, England, United Kingdom, Europe

Banff, the Bow Falls and prestigious Banff Springs Hotel, at dusk, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Casa de Fidel (Fidel Castro's House), Comandancia de la Plata, Sierra Maestra, Granma Province, Cuba, West Indies, Caribbean, Central America

View towards Pico Turquino, Santo Domingo, Sierra Maestra, Granma Province, Cuba, West Indies, Caribbean, Central America

Colorado chipmunk (Eutamias quadrivittatus), San Juan National Forest, Colorado, United States of America, North America

Rosy paintbrush (Castilleja rhexifolia) and Alpine avens (Acomastylis rossii turbinata), San Juan National Forest, Colorado, United States of America, North America

Alpine meadow with wildflowers, San Juan National Forest, Colorado, United States of America, North America

White-tailed ptarmigan (Lagopus leucurus) in summer plumage, San Juan National Forest, Colorado, United States of America, North America

Sunrise in an Alpine meadow with wildflowers, San Juan National Forest, Colorado, United States of America, North America

Mountain goat (Oreamnos americanus) juvenile and kid, Mount Evans, Arapaho-Roosevelt National Forest, Colorado, United States of America, North America