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Male Magnificent Frigatebird (Fregata magnificens) with inflated gular sac, North Seymour Island, Galapagos National Park, Ecuador, South America

Hippopotamus (Hippopotamus amphibious) bathing in the water, Queen Elizabeth National Park, Uganda, East Africa, Africa

Tourists watching the stunning Murchison Falls (Kabarega Falls), Murchison Falls National Park, Uganda, East Africa, Africa

Sintra National Palace, formerly the Royal or Town Palace, Sintra, UNESCO World Heritage Site, Portugal, Europe

Male Mountain Bluebird (Sialia currucoides) with food at the nest, Yellowstone National Park, Wyoming, United States of America, North America

Black-Backed Jackal (Silver-Backed Jackal) (Canis mesomelas), Kruger National Park, South Africa, Africa

Alpine Shooting Star (Dodecatheon alpinum), Yellowstone National Park, Wyoming, United States of America, North America

Bull moose (Alces alces), Roosevelt National Forest, Colorado, United States of America, North America

The beehive-like mounds in the Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle Mountain Range, Western Australia, Australia, Pacific

Boulders and granite hills, Alabama Hills, Inyo National Forest, California, United States of America, North America

Llanberis Pass (Bwlch Llanberis) at Pen-y-Pass, Snowdonia National Park, Gwynedd, Wales, United Kingdom, Europe

Infant Chacma baboon (Papio ursinus) riding on its mother's back, Kruger National Park, South Africa, Africa

Crabtree Beck running down Loweswater Fell in the Lake District National Park, Cumbria, England, United Kingdom, Europe

Aerial image of Castlerigg Stone Circle, a prehistoric monument in snow, near Keswick, Lake District National Park, Cumbria, England, United Kingdom, Europe

Auyantepui (Auyantepuy) (Devil's Mountain) summit, Blackwater River (Golden River), Canaima National Park, UNESCO World Heritage Site, Venezuela, South America

Southern Ground-Hornbill or Ground Hornbill (Bucorvus leadbeateri) adult, Serengeti National Park, Tanzania

Black bear (Ursus americanus) sow and two yearling cubs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

View of Mount Everest, 8850m, from Gokyo Ri, 5483m, Gokyo, Solu Khumbu Everest Region, Sagarmatha National Park, Himalayas, Nepal, Asia

Prayer flags at the Everest Base Camp sign, Solu Khumbu Everest Region, Sagarmatha National Park, Himalayas, Nepal, Asia

Sandhill crane (Grus canadensis), Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

View to Crummock Water from Great Borne in winter, Lake District National Park, Cumbria, England, United Kingdom, Europe

Amphitheatre, ruins of the Roman-Byzantine city of Scythopolis, Tel Beit Shean National Park, Beit Shean, Israel, Middle East

Bluebells in Millers Wood near to Colton in the Lake District National Park, Cumbria, England, United Kingdom, Europe

Hovenweep Castle, Square Tower Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America

Mortuary chapel and graves, San Jose de Tumacacori Mission, established in 1691, Tumacacori National Historic Park, New Mexico, United States of America, North America

Petroglyphs, created by the prehistoric Hohokam people, about 1000 years ago, West-Tucson Mountain District, Saguaro National Park, Arizona, United States of America, North America

Sandstone hill at dawn, Grand Staircase-Escalante National Monument, Utah, United States of America, North America

Scree field on the side of a sandstone butte, Capitol Reef National Park, Utah, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Summit ridge, climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Thousands of flamingos at Laguna Colorada, a salt lake in the Altiplano of Bolivia in Eduardo Avaroa Andean Fauna National Reserve, Bolivia, South America

Piazza San Benedetto Square, Norcia, Monti Sibillini National Park, Perugia District, Umbria, Italy, Europe

View east from Milecastle 37 approaching Housesteads Wood, Hadrians Wall, UNESCO World Heritage Site. Northumberland National Park, England, United Kingdom, Europe

Underwater view of a scuba diver entering the water, Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

Cathedral of the Peak in snow, Tideswell, Peak District National Park, Derbyshire, England, United Kingdom, Europe

Lady Bowen Falls, the tallest waterfall at Milford Sound, Fiordland National Park, UNESCO World Heritage Site, South Island, New Zealand, Pacific

People on walkway at Perito Moreno Glaciar, Los Glaciares National Park, UNESCO World Heritage Site, near El Calafate, Patagonia, Argentina, South America

A grazing springbok, Pilaneesberg National Park, West of Pretoria, North West Province, South Africa, Africa

White fronted Capuchin monkey (Cebus albifrons), Monkey Island (Isla de los Monos), Tambopata National Reserve, Peru, South America

Kasha-Katuwe Tent Rock National Monument, tent like rock formations, from volcanic eruptions 6 to 7 million years ago, New Mexico, United States of America, North America

Lake Matheson, Mount Tasman and Mount Cook, Westland Tai Poutini National Park, UNESCO World Heritage Site, West Coast, Southern Alps, South Island, New Zealand, Pacific

Half Dome from Glacier Point, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Chaco Culture National Historic Park, World Heritage Site, Pueblo Bonito, kiva (foreground), UNESCO World Heritage Site, New Mexico, United States of America, North America

Chaco Culture National Historic Park, World Heritage Site, Pueblo Bonito, kiva (foreground), UNESCO World Heritage Site, New Mexico, United States of America, North America

Mountain goat (Oreamnos americanus) nanny and kid, Glacier National Park, Montana, United States of America, North America

Castlerigg Stone Circle at sunset, Lake District National Park, Cumbria, England, United Kingdom, Europe

Purple soft coral, Ras Mohammed National Park, off Sharm el Sheikh, Sinai, Egypt, Red Sea, Egypt, North Africa, Africa

Polar bear (Ursus maritimus) and cubs, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Polar bear (Ursus maritimus) and cubs, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Rhododendrons in bloom and mountains, Snowdonia National Park, Gwynedd, Wales, United Kingdom, Europe

Least sandpiper (Calidris minutilla) wading while feeding, Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Black bear (Ursus americanus) cub of the year or spring cub climbing a tree, Yellowstone National Park, Wyoming, United States of America, North America

Ruins of Ancestral Puebloans, dating from between 900 AD and 1200 AD, Holly Group, Hovenweep National Monument, Utah, United States of America, North America

Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, United States of America, North America

Canyon de Chelly National Monument, View from the Whitehouse Overlook, Arizona, United States of America

Tlingit Housepost in Sitka National Historical Park, Sitka, Baranof Island, Southeast Alaska, United States of America, North America

Jetty on Ullswater at dawn, Glenridding Village, Lake District National Park, Cumbria, England, United Kingdom, Europe

Wilson Peak at dawn in the fall, Uncompahgre National Forest, Colorado, United States of America, North America

Box elder (boxelder maple) (maple ash) (Acer negundo) branch with yellow leaves in the fall, Capitol Reef National Park, Utah, United States of America, North America

Hikers are dwarfed by the volcanic Mount Ngauruhoe on the Tongariro Crossing trail, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

The Sunwapta River which is a tributary of the Athabasca River in jasper National Park, Alberta, Canada, North America

View from Cadillac Mountain, Acadia National Park, Mount Desert Island, Maine, New England, United States of America, North America

Yellow aspens and evergreens with low clouds, Wasatch-Cache National Forest, Utah, United States of America, North America

Polar bear (Ursus maritimus) and cub, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Two greater flamingo (Phoenicopterus roseus) feeding, Serengeti National Park, Tanzania, East Africa, Africa

Field of yellow dryad (yellow mountain-avens) (Dryas drummondii) in the seed-pod stage, Jasper National Park, UNESCO World Heritage Site, Alberta, Rocky Mountains, Canada, North America

Stormy summer day at El Chalten, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America

Red-billed oxpecker (Buphagus erythrorhynchus) on a Cape buffalo (African buffalo) (Syncerus caffer), Kruger National Park, South Africa, Africa

Cape mountain zebra (Equus zebra zebra) sparring, Mountain Zebra National Park, South Africa, Africa

Grizzly bear (Ursus arctos horribilis), Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America