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White rhino (Ceratotherium simum), with redbilled oxpecker (Buphagus erythrorhynchus), Royal Hlane National Park, Swaziland, Africa

Grey seal (Halichoerus grypus), Farne Islands, Seahouses, Northumberland, England, United Kingdom, Europe

White-crowned sparrow (Zonotrichia leucophrys), Chiricahuas, Coronado National Forest, Arizona, United States of America, North America

American dipper (water ouzel) (Cinclus mexicanus) standing on ice, Yellowstone National Park, Wyoming, United States of America, North America

Captive gray wolf (Canis lupus) howling in the snow, near Bozeman, Montana, United States of America, North America

Gray wolf (Canis lupus) in captivity, near Bozeman, Montana, United States of America, North America

Adult Swallow-Tailed Gull, showing breeding season red rimmed eye, a nocturnal equatorial seabird, found almost exclusively in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Aerial drone view of particular ice textures formed in the Hoffelsjokull glacier following global warming, Iceland, Polar Regions

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

Group of fishermen on boat preparing for fish harvest on foggy morning, Rozmberk Pond, UNESCO Biosphere, Trebon, Jindrichuv Hradec District, South Bohemian Region, Czech Republic (Czechia), Europe

Two fishermen on boat preparing for fish harvest, Rozmberk Pond, UNESCO Biosphere, Trebon, Jindrichuv Hradec District, South Bohemian Region, Czech Republic (Czechia), Europe

Museum in the Chauvet-Pont-d'Arc Cave, UNESCO World Heritage Site, Ardeche, Auvergne-Rhone-Alpes, France, Europe

California gray whale calf (Eschrictius robustus), being touched by tourist in San Ignacio Lagoon, Baja California, Mexico, North America

A long-beaked common dolphin (Delphinus capensis), surfacing off Gorda Banks, Baja California Sur, Mexico, North America

The ancient Macellum of Pozzuoli, a market building, erroneously identified as a Serapeum when a statue of Serapis was discovered, Pozzuali, near Naples, Campania, Italy, Europe

Two modern, multi-story buildings with curved facades and numerous windows and balconies. One building is predominantly gray, the other features glass-fronted balconies. The sky is a clear blue in London, UK.

Tufted gray langurs (Semnopithecus priam), grooming each other in Polonnaruwa, UNESCO World Heritage Site, Sri Lanka, Asia

A European rabbit (Oryctolagus cuniculus) comes out of his burrow at sunset in Richmond Park, Richmond, Greater London, England, United Kingdom, Europe

A tufted gray langur (Semnopithecus priam) showing a threat display in Polonnaruwa, UNESCO World Heritage Site, Sri Lanka, Asia

Gold Harbour packed with Southern Elephant Seals (Mirounga leonina) and King penguins (Aptenodytes patagonicus), South Georgia, Polar Regions

Gray-headed Chachalaca (Ortalis cinereiceps), Boca Tapada, Alajuela Province, Costa Rica, Central America

Flock of rock doves (rock pigeons) (common pigeons) (Columba livia) in Mykonos, Cyclades, Greek Islands, Greece, Europe

Rear view of man photographing Aletsch Glacier with smartphone from Eggishorn viewpoint, Bernese Alps, canton Valais, Switzerland, Europe

A mother and infant tufted gray langur (Semnopithecus priam) with a toque macaque in Polonnaruwa, Sri Lanka, Asia

A mother tufted gray langur (Semnopithecus priam), with her infant in Polonnaruwa, UNESCO World Heritage Site, Sri Lanka, Asia

Tufted gray langurs (Semnopithecus priam), grooming each other in Polonnaruwa, UNESCO World Heritage Site, Sri Lanka, Asia

California gray whale (Eschrichtius robustus) mother and calf underwater in San Ignacio Lagoon, Baja California Sur, Mexico, North America

Gray wolf (Canis lupus) 870F of the Junction Butte Pack at an elk carcass in the winter, Yellowstone National Park, Wyoming, United States of America, North America

Gray wolf (Canis lupus) 870F of the Junction Butte Pack in the winter, Yellowstone National Park, Wyoming, United States of America, North America

California gray whale (Eschrichtius robustus), flukes up dive in San Ignacio Lagoon, Baja California Sur, Mexico, North America

California gray whale calf (Eschrichtius robustus) underwater in San Ignacio Lagoon, Baja California Sur, Mexico, North America

Nefertiti Petroglyphs, Gray Canyon, North of Green River, Utah, United States of America, North America

View of Sunset Crater Volcano from the east slope of the Lenox Crater Trail, the dark gray soil is volcanic pumice, Arizona, United States of America, North America

Adult mother red fox (Vulpes vulpes), near her den at Leigh Lake, Grand Teton National Park, Wyoming, United States of America, North America

Man exulting with outstretched arms looking at Aletsch Glacier from Eggishorn viewpoint, Bernese Alps, canton of Valais, Switzerland, Europe

California gray whale (Eschrichtius robustus), with whale watchers, San Ignacio Lagoon, Baja California Sur, Mexico, North America

Whale watcher with California gray whale (Eschrichtius robustus), San Ignacio Lagoon, Baja California Sur, Mexico, North America

Whale watchers with California gray whale (Eschrichtius robustus), San Ignacio Lagoon, Baja California Sur, Mexico, North America

California gray whales (Eschrichtius robustus), courtship behavior, San Ignacio Lagoon, Baja California Sur, Mexico, North America

California gray whale calf (Eschrichtius robustus), underwater, San Ignacio Lagoon, Baja California Sur, Mexico, North America

Rocky shore of Watson Lake which has lost much water due to the drought, the gray rock was originally submerged, Arizona, United States of America, North America

Rocky lagoon in Watson Lake along Lakeshore Trail, gray rock shows how much water volume was lost due to the drought, Arizona, United States of America, North America

Back view of two young people and their beloved wolf dog sitting and hugging in an old town street staring at the sun, Piemonte, Italy, Europe

Reflective lagoon along East Bay Trail of Willow Lake, gray line on rock is where the water level used to be, Prescott, Arizona, United States of America, North America

California gray whale calf (Eschrictius robustus), and tourist's hand in San Ignacio Lagoon, Baja California, Mexico, North America

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

Adult California gray whale (Eschrictius robustus), spy-hopping in San Ignacio Lagoon, Baja California, Mexico, North America

Neuschwanstein Castle, Southern Bavaria. This 19th-century historicist palace is built on a rugged hill of the foothills of the Alps in the very south of Germany and is a UNESCO World Heritage site.

Neuschwanstein Castle, Southern Bavaria. This 19th-century historicist palace is built on a rugged hill of the foothills of the Alps in the very south of Germany and is a UNESCO World Heritage site.

The intertidal zone of the Quantock Coast, West Somerset, contains an abundance of geology and wildlife. It is a Site of Special Scientific Interest (SSSI) and is of international geological importance.

The intertidal zone of the Quantock Coast, West Somerset, contains an abundance of geology and wildlife. It is a Site of Special Scientific Interest (SSSI) and is of international geological importance.

The intertidal zone of the Quantock Coast, West Somerset, contains an abundance of geology and wildlife. It is a Site of Special Scientific Interest (SSSI) and is of international geological importance.

The intertidal zone of the Quantock Coast, West Somerset, contains an abundance of geology and wildlife. It is a Site of Special Scientific Interest (SSSI) and is of international geological importance.

The intertidal zone of the Quantock Coast, West Somerset, contains an abundance of geology and wildlife. It is a Site of Special Scientific Interest (SSSI) and is of international geological importance.

Hills of purple and gray bentonite near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A deep canyon eroded thru the hills of purple and gray bentonite clay near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A deep canyon eroded thru the hills of purple and gray bentonite clay near Hamilili Point on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Single car crossing Rannoch Moor on the A82 Trunk Road at dusk with Beinn a Chreachain and the Grampian Mountains behind, Rannoch Moor, Argyll and Bute, Scottish Highlands, Scotland, United Kingdom, Europe

Frozen Loch Droma backed by Meall Breac, Dirrie More, Scottish Highlands, Scotland, United Kingdom, Europe

A small hill of gray bentonite clay that appears to be melting into the purple bentonite of Hamilili Valley on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A ridge of gray bentonite viewed from a nearby flat top mesa on the south end of Petrified Forest National Park, Arizona, 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

An adult California gray whale, Eschrichtius robustus, surfacing near homes in Newport Beach, California, USA.

An adult California gray whale, Eschrichtius robustus, surfacing near homes in Newport Beach, California, USA.

View of sculpture and Piazza del Plebiscito, historic centre, UNESCO World Heritage Site, Naples, Campania, Italy, Europe

Detail of modern administrative building Main Point Karlin, Karlin, Prague, Czech Republic (Czechia), Europe

Modern Dancing House (Ginger and Fred building), designed by Frank Gehry and Vlado Milunic, Prague, Czech Republic (Czechia), Europe