Camel trekking at the Erg Chebbi sand dunes near Merzouga, Morocco

A private bush lunch under an Umbrella Thorn Acacia in Serengeti National Park, Tanzania

Serengeti National Park, Tanzania

Lionesses bask in Serengeti National Park, Tanzania

The wildebeest migration in Serengeti National Park, Tanzania

A hippo pool in Serengeti National Park, Tanzania

Wild horses (or brumbies) grazing near the Mary River floodplain wetlands. Top End, Northern Territory, Australia. Photo: Peter Eve

Sea Kayaking in Abel Tasman National Park near Marahau, South Island, New Zealand

Fly fishing a river in the South Island, New Zealand

Helicopter tour of a glacial lake in the South Island, New Zealand

Camping with friends in the South Island, New Zealand

The patterned landscape near Wahlenbergfjord. Svalbard Archipelago, Norway

A Polar Bear (Ursus maritmus) on the Southern edge of the Polar pack ice. Svalbard Archipelago, Norway

An Atlantic puffin (Fratercula arctica) near the city of Tinaryebukta. Svalbard Archipelago, Norway

Arctic ice in Leifdefjord. Svalbard Archipelago, Norway

A colony of Kittiwake (Rissa tridactyla) near Monacobreen glacier. Svalbard Archipelago, Norway

Polar bears (Ursus maritimus) near Hinlopin Strain. Svalbard Archipelago, Norway

A Polar bear (Ursus maritimus) near Edgeøya. Svalbard Archipelago, Norway

The fluke of a Humpback Whale (Megaptera novaeangkiae) near Gnalodden. Svalbard Archipelago, Norway

Cascading water at Nordaustland Ice Cap. Svalbard Archipelago, Norway

An Ivory gull (Pagophilia eburnea) near Holmebukta. Svalbard Archipelago, Norway

A Kittiwake (Rissa tridactyla). Svalbard Archipelago, Norway. Photo: Jack Putnam

A weathered shack near Sorgfjord. Svalbard Archipelago, Norway. Photo: Jack Putnam

Wall of Walruses (Odobenus rosmarus) near Phippsoya. Svalbard Archipelago, Norway. Photo: Jack Putnam

Three curious Polar bears (Ursus maritimus) near Olga Strait. Svalbard Archipelago, Norway. Photo: Jack Putnam

A Polar bear (Ursus maritimus) leaps near Wahlenbergfjord. Svalbard Archipelago, Norway. Photo: Jack Putnam

A Brünnich's Guillemot (Uria lomvia) near Cape Fanshawe, Hinlopen Strait. Svalbard Archipelago, Norway. Photo: Jack Putnam

Colony of Brünnich's Guillemot (Uria lomvia) near Cape Fanshawe, Hinlopen Strait. Svalbard Archipelago, Norway. Photo: Jack Putnam

Whale vertebrae on Edgeøya. Svalbard Archipelago, Norway. Photo: Jack Putnam

A Glaucous gull (Larus hyperboreus) on the south coast of Edgeøya. Svalbard Archipelago, Norway. Photo: Jack Putnam

An Arctic Tern (Sterna paradisaea) near Leifdefjord. Svalbard Archipelago, Norway. Photo: Jack Putnam

Little Auk/Dovekie (Alle alle) near Bolshoya. Svalbard Archipelago, Norway. Photo: Jack Putnam

An Arctic Tern (Sterna paradisaea) near Bolshoya. Svalbard Archipelago, Norway. Photo: Jack Putnam

An Arctic Tern (Sterna paradisaea) near Bolshoya. Svalbard Archipelago, Norway. Photo: Jack Putnam

Three Walruses (Odobenus rosmarus) near Hinlopin Strait. Svalbard Archipelago, Norway. Photo: Jack Putnam

Fog bow near the Southern edge of Polar pack ice. Svalbard Archipelago, Norway. Photo: Jack Putnam

Polar Ice Cap near Braasvellbreen. Svalbard Archipelago, Norway. Photo: Jack Putnam

Peek-a-boo Polar bear (Ursus maritimus) near Nordaustland Ice Cap. Svalbard Archipelago, Norway. Photo: Jack Putnam

A Polar bear (Ursus maritimus) swims near Phippsoya. Svalbard Archipelago, Norway. Photo: Jack Putnam

Polar land- and seascape near Hinlopen Strait. Svalbard Archipelago, Norway. Photo: Jack Putnam

Swamp buffalo grazing. Top End, Northern Territory, Australia. Photo: Peter Eve

The Convento de Cuilápan south of Oaxaca de Juárez, Mexico

A local fisherman casts his net at the base of Salto de Eyipantla waterfall in Veracruz, Mexico

Traditional dancers perform at a local celebration at Mérida, Yucatán, Mexico

Traditional dancers perform at a local celebration at Mérida, Yucatán, Mexico