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Remarkable sandstone rock carved by erosion in the Ashar Valley, AlUla, Medina Province, Saudi Arabia

Adult brown pelicans (Pelecanus occidentalis), on a small islet near Isla Salsipuedes, Baja California, Mexico, North America

Closeup of an Arizona Gopher Snake (Pituophis Catenifer), a non-venomous constrictor harmless to humans, Arizona, United States of America, North America

Local woman standing on a rock in beautiful mountain scenery along the road from Massawa to Asmara, Eritrea, Africa

Sandstone cliff formations at sunrise on Isla San Jose, Baja California Sur, Sea of Cortez, Mexico, North America

Galapagos Marine Iguana (Amblyrhynchus cristatus) Santa Cruz island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Adult San Esteban spiny-tailed iguana (Ctenosaura conspicuosa), endemic to Isla San Esteban, Baja California, Mexico, North America

Gray clay flats below Anvil Hill west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

Blue-footed boobies (Sula nebouxii), on a small islet near Isla Salsipuedes, Baja California, Sea of Cortez, Mexico, North America

Espíritu Santo antelope squirrel (Ammospermophilus insularis), on Isla Espiritu Santo, Sea of Cortez, Mexico, North America

Steller sea lions (Eumetopias jubatus) on a rocky shore, Alert Bay, Inside Passage, British Columbia, Canada, North America

The interior soldado of Isla Espiritu Santo, Baja California Sur, Sea of Cortez, Mexico, North America

Layers of lava flows and tuff from the dormant volcano on Isla Tortuga, Baja California, Sea of Cortez, Mexico, North America

Camel caravan along Wadi Saba canyon towards salt mines, Asso Bhole, Dallol, Danakil Depression, Afar Region, Ethiopia, Africa

Brown noddy (Anous stolidus) pair at nest site on Floreana Island, Galapagos, Ecuador, South America

A pair of least chipmunks (Neotamias minimus), at Phelps Lake, Grand Teton National Park, Wyoming, United States of America, North America

Ian Brown stand up paddle surfs a whitewater wave on the Potomac River near Potomac, Maryland, United States of America, North America

Ian Brown stand up paddle surfs challenging whitewater below Great Falls of the Potomac River, border of Maryland and Virginia, United States of America, North America

Pentre Ifan Neolithic (New Stone Age) burial chamber in the Preseli Hills, Nevern, Pembrokeshire, Wales, United Kingdom, Europe

Guadalupe fur seal (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Kayak at the foot of cliff near Cala Galdana, South Coast of Cala Galdana, Menorca, Balearic Islands, Spain, Mediterranean, Europe

Blue Footed Booby spreading its wings on rocks with Fiddler crab, Isabela Island, Galapagos, Ecuador, South America

Photographer Skip Brown on a stand up paddle board at the mouth of Havasu Creek in the Grand Canyon, Arizona, United States of America, North America

Ian Brown stand up paddle surfs challenging whitewater below Great Falls of the Potomac River, border of Maryland and Virginia, United States of America, North America

Galapagos sea lion (Zalophus wollebaeki) pup nursing in Puerto Egas, Santiago Island, Galapagos Islands, UNESCCO World Heritage Site, Ecuador, South America

Heermann's gulls (Larus heermanni), at breeding colony on Isla Rasa, Baja California, Sea of Cortez, Mexico, North Anerica

Sol de Manana, a geothermal field in Sur Lipez Province in the Potosi Department, Bolivia, South America

Seal and seabird look at each other on a rock in the calm sea, near Alert Bay, Inside Passage, British Columbia, Canada, North America

Ian Brown stand up paddle surfs challenging whitewater below Great Falls of the Potomac River, border of Maryland and Virginia, United States of America, North America

Adelie penguin (Pygoscelis adeliae), parent on a chick and egg at Brown Bluff, Antarctic Sound, Antarctica, Polar Regions

Guadalupe fur seal (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Skip Brown surfs his whitewater kayak on a glassy standing wave on the Colorado River through the Grand Canyon, Arizona, United States of America, North America

Blue-footed booby (Sula nebouxii) adult with chick on North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

A schooner returns to dock at sunset at Bailey Island, Casco Bay, Maine, United States of America, North America

Camel riding in Australian desert with Uluru (Ayers Rock) in the distance, Outback, Northern Territory, Australia, Pacific

California sea lion (Zalophus californianus), hauled out on Isla San Pedro Martir, Sea of Cortez, Mexico, North America

Adult brown pelicans (Pelecanus occidentalis), on a small islet near Isla Salsipuedes, Baja California, Mexico, North America

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

A whitewater kayaker runs the drop known as Bitch Monkey on the Great Falls of the Potomac River, Maryland, United States of America, North America

Steller sea lion (Eumetopias jubatus), haul out, South Marble Island, Glacier Bay National Park, Alaska, United States of America, North America

Skip Brown paddles his whitewater kayak through rapids on the Colorado River through the Grand Canyon, Arizona, United States of America, North America

Ian Brown stand up paddle boards the Widewater section of C and O Canal (Chesapeake and Ohio Canal) near Potomac, Maryland, United States of America, North America

Adult brown pelicans (Pelecanus occidentalis), on a small islet near Isla Salsipuedes, Baja California, Mexico, North America

An adult golden-mantled ground squirrel (Callospermophilus lateralis) feeding, Rocky Mountain National Park, Colorado, United States of America, North America

Guadalupe fur seals (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Round-tailed ground squirrel (Spermophilus tereticaudus), The Pond, Amado, Arizona, United States of America, North America

Kayaker Ian Brown heads off the Spout, the last drop of Great Falls of the Potomac River, Virginia, United States of America, North America

A pair of adult brown noddies (Anous stolidus), on rocky outcropping on Isabela Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Brown pelican (Pelecanus occidentalis) portrait at Isla Angel de la Guarda, Baja California, Mexico, North America

Adult brown pelicans (Pelecanus occidentalis), on a small islet near Isla San Marcos, Baja California, Mexico, North America

Tourist woman jumping at Uluru (Ayers Rock) in Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Central Australia, Pacific

California sea lions (Zalophus californianus), stampeding on the beach in Puerto Refugio, Baja California, Sea of Cortez, Mexico, North America

King penguin (Aptenodytes patagonicus) chicks called Okum Boys at Gold Harbor, South Georgia, Polar Regions

Ventifacts blown by the wind into the soft tuff material at Brown Bluff, Antarctic Sound, Antarctica, Polar Regions

Brown pelicans (Pelecanus occidentalis) in breeding plumage at Isla Rasita, Baja California, Mexico, North America

Adelie penguin (Pygoscelis adeliae), breeding colony at Brown Bluff, Antarctic Sound, Antarctica, Polar Regions

Adult Andean fox (Lycalopex culpaeus) near its den in the Andean Central Volcanic Zone, Antofagasta Region, Chile, South America

Skip Brown surfs his whitewater kayak on a glassy standing wave on the Colorado River through the Grand Canyon, Arizona, United States of America, North America

Ian Brown stand up paddle surfs challenging whitewater below Great Falls of the Potomac River, border of Virginia and Maryland, United States of America, North America

A kayaker surfs big standing waves of the Potomac River near Great Falls in his whitewater boat, Virginia, United States of America, North America

Ian Brown kayaks the Maryland side of Great Falls of the Potomac River, Maryland, United States of America, North America

Juvenile brown pelican (Pelecanus occidentalis), sunbathing on Isla Ildefonso, Baja California, Mexico, North America

A mother brown bear (Ursus arctos), feeding with her cubs in Geographic Harbor, Katmai National Park, Alaska, United States of America, North America

King penguin (Aptenodytes patagonicus) chicks called Okum Boys at Gold Harbor, South Georgia, Polar Regions

Skip Brown surfs Odeck wave below Great Falls on the Potomac River, Virginia, United States of America, North America

Ian Brown stand up paddle surfs challenging whitewater below Great Falls of the Potomac River, border of Maryland and Virginia, United States of America, North America

An adult brown bear (Ursus arctos), in the grass, Lake Eva, Baranof Island, Southeast 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

Yellowbelly marmot (yellow-bellied marmot) (Marmota flaviventris), Mount Evans, Colorado, United States of America, North America

Alpine Chamois (Rupicapra rupicapra), Valsavarenche, Gran Paradiso National Park, Aosta Valley, Italy, Europe

Adult gentoo penguin (Pygoscelis papua), feeding hungry chicks at Brown Bluff, Antarctica, Polar Regions

Adult brown noddies (Anous stolidus), on rocky outcropping on Isabela Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

An adult golden-mantled ground squirrel (Callospermophilus lateralis) feeding in Rocky Mountain National Park, Colorado, United States of America, North America

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

The domed rock formations of Kata Tjuta (Mount Olgas) in Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Central Australia, Pacific

Adelie penguins (Pygoscelis adeliae) at breeding colony at Brown Bluff, Antarctica, Southern Ocean, Polar Regions

Angel's Window at Cape Royal on North Rim above Unker Creek near sundown, with smoke from a wildfire creating brown haze on the horizon, Gand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

King penguin (Aptenodytes patagonicus) chick molting its downy feathers at Gold Harbor, South Georgia, Polar Regions

Adult gentoo penguin (Pygoscelis papua), feeding hungry chicks at Brown Bluff, Antarctica, Polar Regions