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Adult pink salmon, Oncorhynchus gorbuscha, returning to the Indian River to spawn near Sitka, Alaska, United States of America

An adult female anhinga, Anhinga anhinga, drying her wings in Tortuguero National Park, Costa Rica, Central America

An adult male anhinga, Anhinga anhinga, at night in Tortuguero National Park, Costa Rica, Central America

Hikers watch a condor (Vultur gryphus), Ferrier Vista Point, eastern flank of Pingo Valley, Torres del Paine National Park, Patagonia, Chile, South America

Black Hills Wild Horse Sanctuary, Hot Springs, South Dakota, United States of America, North America

Two Bison (Bison bison) bulls sparring, Yellowstone National Park, Wyoming, United States of America, North America

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

Female Santa Cruz lava lizard (Microlophus indefatigabilis) on Santa Cruz Island, Galapagos Islands, Ecuador, South America

Young bull southern elephant seal, Mirounga leonina, sneaking near female, Gold Harbour, South Georgia Island, Atlantic Ocean

Marine iguana (Amblyrhynchus cristatus), Espinosa Point, Isla Fernandina (Fernandina Island), Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Grizzly bear (Ursus arctos horribilis) sow, Yellowstone National Park, Wyoming, United States of America, North America

Sally lightfoot crab (Grapsus grapsus) and marine iguana, Espinosa Point, Isla Fernandina (Fernandina Island), Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Coyote (Canis latrans) in the snow, Yellowstone National Park, Wyoming, United States of America, North America

Northern minke whale, Balaenoptera acutorostrata, surfacing in Cattle Pass, San Juan Islands, Washington, United States of America, North America

Juvenile glaucous-winged gull (Larus glaucescens), Inian Pass, Southeast Alaska, United States of America, North America

Brown or grizzly bear (Ursus arctos) fishing for salmon in Great Bear Rainforest, British Columbia, Canada, North America

Close-up of European common frog (Rana temporaria), North Brabant, The Netherlands, (Holland), Europe.

Steller sea lion (northern sea lion) (Eumetopias jubatus) colony outside Prince Rupert, British Columbia, Canada, North America

Glasseye (Heteropriacanthus cruentatus) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Bluespine unicorn fish (Naso unicornis) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Pelicans at sunset over Playa Guiones surf beach, Nosara, Nicoya Peninsula, Guanacaste Province, Costa Rica, Central America

Young polar bear (Ursus maritimus) on the ice in Bear Sound, Spitsbergen Island, Svalbard, Norway, Scandinavia, Europe

Adult ivory gull (Pagophila eburnea), Bear Sound, Spitsbergen Island, Svalbard, Norway, Scandinavia, Europe

Adult humpback whale (Megaptera novaeangliae), Sorkapp, Svalbard Archipelago, Norway, Scandinavia, Europe

Adult fin whale (Balaenoptera physalus), Sorkapp, Spitsbergen Island, Svalbard Archipelago, Norway, Scandinavia, Europe

Southern elephant seal (Mirounga leonina), female with her pup, Sea Lion Island, Falkland Islands, South America

Blacktail Jackrabbit (Lepus californicus) in the snow, Antelope Island State Park, Utah, United States of America, North America

Wild horse (Equus Caballus) mare and foal, Green River, Wyoming, United States of America, North America

Black-necked stilt (Himantopus mexicanus) with reflection, Bear River Migratory Bird Refuge, Utah, United States of America, North America

Marine Iguana (Amblyrhynchus cristatus), Turtle Bay, Isla Santa Cruz, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Sally Lightfoot crab (Grapsus Grapsus), Sullivan Bay, Isla Santiago, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Two black-tailed prairie dog (blacktail prairie dog) (Cynomys ludovicianus), Custer State Park, South Dakota, United States of America, North America

Male impala (Aepyceros melampus) with two red-billed oxpeckers (Buphagus erythrorhynchus), Kruger National Park, South Africa, Africa

Young Chacma baboon (Papio ursinus) chewing on a piece of plastic, Kruger National Park, South Africa, Africa

Chapman's zebra (Plains Zebra) (Equus burchelli antiquorum) drinking, Kruger National Park, South Africa, Africa

Cape buffalo (African buffalo) (Syncerus caffer) cow and calf drinking, Kruger National Park, South Africa, Africa

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

Adult cape petrels (Daption capense) in rough seas in English Strait, South Shetland Islands, Antarctica, Polar Regions

Grizzly bear (Ursus arctos horribilis) in the rain, Glacier National Park, Montana, United States of America, North America

Hoary marmot (Marmota caligata), Glacier National Park, Montana, United States of America, North America

Mountain goat (Oreamnos americanus), Mount Evans, Arapaho-Roosevelt National Forest, Colorado, United States of America, North America

California sea lion (Zalophus californianus), Los Islotes, Baja California Sur, Gulf of California (Sea of Cortez), Mexico, North America

Sperm whale (Physeter macrocephalus) surfacing, Isla San Pedro Martir, Gulf of California (Sea of Cortez), Baja California Norte, Mexico

Elegant tern (Thalasseus elegans) breeding colony, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Brown pelicans (Pelecanus occidentalis) plunge-diving, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Brown pelicans (Pelecanus occidentalis), Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Humpback whale (Megaptera novaeangliae) breach, Gulf of California (Sea of Cortez), Baja California Sur, Mexico, North America

Humpback whale (Megaptera novaeangliae) calf breach, Gulf of California (Sea of Cortez), Baja California Sur, Mexico, North America

Short-finned pilot whale (Globicephala macrorhynchus), Isla San Pedro Martir, Gulf of California (Sea of Cortez), Baja California Norte, Mexico, North America

Magnificent frigatebird (Fregata magnificens), Gulf of California (Sea of Cortez), Baja California Sur, Mexico, North America

Galapagos fur seal (Arctocephalus galapagoensis) bulls mock-fighting underwater, Genovesa Island, Galapagos Islands, Ecuador, South America

Adult dark morph red-footed booby (Sula sula), Genovesa Island, Galapagos Islands, Ecuador, South America

Adult swallow-tailed gull (Creagrus furcatus), Genovesa Island, Galapagos Islands, Ecuador, South America

Adult Nazca booby (Sula grantii) on eggs, Punta Suarez, Santiago Island, Galapagos Islands, Ecuador, South America

Adult waved albatross (Diomedea irrorata) with single egg, Espanola Island, Galapagos Islands, Ecuador, South America

Galapagos sea lion (Zalophus wollebaeki) underwater, Guy Fawkes Islands, Galapagos Islands, Ecuador, South America