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Mobius arch, natural arch formed out of granit rock at sunrise, lone pine peak, 12994, feet, mt. whitney, 14497, feet, highest peak of lower 48, alabama hills, sierra nevada, lone pine, california, usa

Bryce canyon in winter, view from sunset point, hoodoos at surise, bryce canyon national park, paunsaugunt plateau, utah, usa

Coyote buttes north, the wave, sandstone formed by wind and water, paria wilderness area, arizona, usa

Bryce canyon in winter, view from sunset point, hoodoos at surise, bryce canyon national park, paunsaugunt plateau, utah, usa

Bryce canyon in winter, view from sunset point, hoodoos at surise, bryce canyon national park, paunsaugunt plateau, utah, usa

Coyote buttes north, the wave, sandstone formed by wind and water, paria wilderness area, arizona, usa

Oriental hornet (Vespa orientalis) using its jaws to detach two suckersfrom Common Octopus tentacle as it hangs in the sun to tenderise. Skala Sikaminia harbour, Lesbos (Lesvos) Greece. MORE INFO: The yellow parts of this hornet's cuticle absorb sunlight and the pigment xanthopterin converts light into electrical energy.

Goldenrod crab spider (Misumenia vatia) adult female, white form, camouflaged on Wild Angelica (Angelica sylvestris) flowers sinking fangs into the head of a large Horse fly (Dasyrhamphis anthracinus), Corsica, France. MORE INFO: Crab spider family Thomisidae, Horse fly family Tabanidae, plant family Apiaceae.

Formosan or Taiwan macaque (Macaca cyclopis) adult male giving threat yawn while sitting on branch of banyan tree (Ficus microcarpus), Chaishan, Kaohsiung, Taiwan.

Natural rock archway carved by the sea through karst limestone rock at Cuevas del mar (sea caves) beach, near Llanes, Asturias, Spain.

Wigeon (Anas penelope) flock in flight over frozen, flooded marshland on a foggy winter morning, with some drakes calling, Greylake RSPB reserve, Somerset Levels, UK.

Parasite fly or Tachinid fly (Cylindromyia bicolor) feeding on Wild angelica (Angelica sylvestris) umbel flowers, Corsica, France. MORE INFO: Parasite fly or Tachinid fly family Tachinidae, plant family Apiaceae.

Common blue butterfly (Polyommatus icarus) sun basking on grass stem in limestone meadow, Wiltshire, UK. MORE INFO: Butterfly family Lycaenidae.

Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.

Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.

Brown Bear (Ursus arctos) fishing for pink salmon near the salmon weir at Pavlof Harbor on Chichagof Island in Southeast Alaska, USA. Pacific Ocean.

Adult leopard seal (Hydrurga leptonyx) hauled out on ice floe near the Antarctic Peninsula, Southern Ocean

Adult female leopard seal (Hydrurga leptonyx) stalking, then killing and eating an adult gentoo penguin in Paradise Bay, Antarctica, Southern Ocean

A small pod of 8 Type B killer whales (Orcinus nanus) in pack ice near Snow Hill Island Island, Weddell Sea, Antarctica, Southern Ocean

Curious adult leopard seal (Hydrurga leptonyx) approaches Zodiac near Booth Island, Antarctica, Southern Ocean

Adult male green sea turtle (Chelonia mydas) in the protected marine sanctuary at Honolua Bay on the northwest side of the island of Maui, Hawaii, USA

Chinstrap penguin (Pygoscelis antarctica) colony at Baily Head on Deception Island, South Shetland Island Group, Antarctica

Long-beaked common dolphin pod (Delphinus capensis) encountered in the southern Gulf of California (Sea of Cortez), Baja California Sur, Mexico

A small group of caribou (Rangifer tarandus) migrating north to feeding grounds in the spring from Yellowknife, Northwest Territories, Canada

A younger polar bear (Ursus maritimus) scavenging a fresh bearded seal kill, Monacobreen Glacier, Spitsbergen, Norway

Polar bears (Ursus maritimus) adult and cub in snow. Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Polar bear (Ursus maritimus) adult on snow, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Polar bears (Ursus maritimus) adult and cub hunting, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Male Great frigatebird (Fregata minor) in breeding plumage (note the red gular pouch) on North Seymour Island in the Galapagos Island Archipelago, Ecuador

Greater flamingo (Phoenicopterus ruber) in flight over a saltwater lagoon in the Galapagos Island Archipelago, Ecuador

Greater flamingo (Phoenicopterus ruber) foraging for small pink shrimp (Artemia salina) in saltwater lagoon in the Galapagos Island Archipelago, Ecuador

Spotted eagle ray (Aetobatus narinari) underwater at Leon Dormido (Sleeping Lion) Island off San Cristobal Island in the Galapagos Island Archipelago, Ecuador

Great frigatebird (Fregata minor) taking handouts from a fisherman in Puerto Ayora on Santa Cruz Island, in the Galapagos Island Archipelago, Ecuador

Adult brown bear (Ursus arctos) scratching its back on a tree at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Adult common (northern) minke whale (Balaenoptera acutorostrata) sub-surface feeding in the rich waters of Woodfjord, Spitsbergen, Svalbard Archipelago, Norway

The very colorful Galapagos land iguana (Conolophus subcristatus) in the Galapagos Island Archipelago, Ecuador. MORE INFO This large land iguana is endemic to the Galapagos Islands.

Adult brown bear (Ursus arctos) sow with 4 COY (cubs-of-the-year) at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

King penguin (Aptenodytes patagonicus) with introduced reindeer at breeding and nesting colony at St. Andrews Bay on South Georgia, Southern Ocean.

Adult sea otter (Enhydra lutris kenyoni) mother and pup in Inian Pass, Southeastern Alaska, USA. Pacific Ocean

Adult red-billed tropicbird (Phaethon aethereus) in flight in the Galapagos Island Archipelago, Ecuador

Humpback whale (Megaptera novaeangliae) surfacing near Zodiac near the Antarctic Peninsula, Antarctica, Southern Ocean

Male Great frigatebird (Fregata minor) in breeding plumage (note the red gular pouch) on North Seymour Island in the Galapagos Island Archipelago, Ecuador

Male Great frigatebird (Fregata minor) in breeding plumage (note the red gular pouch) on North Seymour Island in the Galapagos Island Archipelago, Ecuador

Svalbard reindeer antlers (Rangifer tarandus platyrhynchus) on the gentle plains of Talaveraflya on the south shore of Borentsoya. in the Svalbard Archipelago, Norway

Humpback whale (Megaptera novaeangliae) flukes-up dive near the Antarctic Peninsula, Antarctica, Southern Ocean

Galapagos penguin (Spheniscus mendiculus) feeding underwater on small baitfish in the Galapagos Island Archipelago, Ecuador

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA, Pacific Ocean

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA, Pacific Ocean

Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.

Hawaiian Spinner Dolphin (Stenella longirostris) spinning, possibly to dislodge attached remoras, Lanai, Hawaii, USA, Pacific Ocean

Gentoo penguin (Pygoscelis papua) chicks covered with mud and guano on Cuverville Island, Antarctica, Southern Ocean

Adult common (northern) minke whale (Balaenoptera acutorostrata) sub-surface feeding in the rich waters of Woodfjord, Spitsbergen, Svalbard Archipelago, Norway

Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.

A small group of caribou (Rangifer tarandus) migrating north to feeding grounds in the spring from Yellowknife, Northwest Territories, Canada

Male great frigatebird (Fregata minor) in breeding plumage in the Galapagos Island Archipelago, Ecuador

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, Ecuador

Adult southern rockhopper penguin (Eudyptes chrysocome chrysocome) at breeding and molting colony on New Island in the Falkland Islands, South Atlantic Ocean

Greater flamingo (Phoenicopterus ruber) foraging for small pink shrimp (Artemia salina) in saltwater lagoon in the Galapagos Island Archipelago, Ecuador

South American Sea Lion (Otaria flavescens) hauled out on small rocky islet just outside Ushuaia, Beagle Channel, Argentina

Adult black-necked stilt (Himantopus mexicanus) wading and feeding in a brackish water lagoon at Punta Cormorant on Floreana Island, Galapagos, Ecuador, Pacific Ocean.

Black-browed albatross (Thalassarche melanophrys) breeding colony on Steeple Jason Island in the Falkland Islands, South Atlantic Ocean

Divers Lisa Trotter and Robert Alexander enter the water with a large, curious, female leopard seal (Hydrurga leptonyx) near Booth Island on the western side of the Antarctic Peninsula, Antarctica

Harp seal (Pagophilus groenlandicus) hauled out on the pack-ice in seas between Iceland and Greenland in the Denmark Strait

A small group of caribou (Rangifer tarandus) migrating north to feeding grounds in the spring from Yellowknife, Northwest Territories, Canada

Wilson's storm-petrel (Oceanites oceanicus) daintily feeding in the calm waters of Neko Harbour on the Antarctic Peninsula

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA, Pacific Ocean

California gray whale (Eschrichtius robustus) calf with excited whale watchers in San Ignacio Lagoon, Baja California Sur, Mexico

Male Great frigatebird (Fregata minor) in breeding plumage (note the red gular pouch) on Genovesa (Tower) Island, in the Galapagos Island Archipelago, Ecuador

Adult green sea turtle (Chelonia mydas) in the protected marine sanctuary at Honolua Bay, Maui, Hawaii, USA

A small group of caribou (Rangifer tarandus) migrating north to feeding grounds in the spring from Yellowknife, Northwest Territories, Canada

Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.

Polar bear (Ursus maritimus) adult on snow, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Lindblad Expeditions guests on board the National Geographic Explorer with a lone adult emperor penguin (Aptenodytes forsteri) on sea ice, Antarctica