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Bison (Bison bison) bull, Yellowstone National Park, Wyoming, United States of America, North America

Male Williamson's sapsucker (Sphyrapicus thyroideus) poking out of its nest hole, Yellowstone National Park, Wyoming, United States of America, North America

Galapagos sea lions (Zalophus wollebaeki), Gardner beach, Santiago Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Nazca booby (Sula grantii), Punta Suarez, Santiago Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Swallow-tailed gull (Creagrus furcatus), Genovesa Island, Galapagos Islands, UNESCO World Heritge Site, Ecuador, South America

Elk (Cervus canadensis) (wapiti), South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Saddle-billed stork (Ephippiorhynchus senegalensis) with a fish, Kruger National Park, South Africa, Africa

Coral encrusted biosphere in the marine reserve at Gangga Island, Sulawesi, Indonesia, Southeast Asia, Asia

Elk (Cervus canadensis) calf nursing, Yellowstone National Park, Wyoming, United States of America, North America

Lion (Panthera leo) cub on a downed tree trunk in the rain, Ngorongoro Crater, Tanzania, East Africa, Africa

Elk (Cervus canadensis) near Lake Village, Yellowstone National Park, Wyoming, United States of America, North America

Two Grizzly Bear (Ursus arctos horribilis) cubs of the year or spring cubs playing, Yellowstone National Park, Wyoming, United States of America, North America

Mother polar bear (Ursus maritimus) walking with a cub on a melting ice floe, Spitsbergen Island, Svalbard archipelago, Arctic, Norway, Scandinavia, Europe

Mother polar bear (Ursus maritimus) walking with two cubs on a melting ice floe, Spitsbergen Island, Svalbard archipelago, Arctic, Norway, Scandinavia, Europe

Penguins below dramatic rock formations, Half Moon Bay, South Sheltand Islands, Antarctica, Polar Regions

Eastern white-bearded wildebeest (Connochaetes taurinus), on the Mara River bank, Masai Mara, Kenya, East Africa, Africa

Exmoor ponies grazing on Winsford Hill in Exmoor National Park, Somerset, England, United Kingdom, Europe

Green-backed heron (striated heron) (Butorides striatus), Kruger National Park, South Africa, Africa

Gentoo penguin on an iceberg reflected in calm waters of sunny Neko Harbour, mountain and glacier backdrop, Antarctica, Polar Regions

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

Gentoo penguin colony, blue icebergs and glacier, Chilean Gonzalez Videla Station, Waterboat Point, Paradise Bay, Antarctica, Polar Regions

Humpback whale (Megaptera novaeangliae), flukes-up dive in Frederick Sound, southeast Alaska, United States of America, North America

Young bull southern elephant seals, Mirounga leonina, fighting for territory in Gold Harbour, South Georgia Island, Atlantic Ocean

Adult azure-tailed skink (Emoia impar), on Makatea, Tuamotus, French Polynesia, South Pacific, Pacific

Adult tawny nurse shark (Nebrius ferrugineus) in the town of Rotoava, Fakarava, French Polynesia, South Pacific, Pacific

Underwater image of the inner lagoon of Apataki coral atoll, Palliser Islands, Tuamotus, French Polynesia, South Pacific, Pacific

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

The main square, Rynek Glowny, in the medieval old town, UNESCO World Heritage Site, Krakow, Poland, Europe

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

Yellow-crowned night-heron (Nyctanassa violacea), Genovesa Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Meerkat (suricate) (Suricata suricatta) standing on its hind legs, Kgalagadi Transfrontier Park, South Africa

Girl feeding parakeets in World of Parrots, KL Bird Park, Kuala Lumpur, Malaysia, Southeast Asia, Asia

Male Sumatran rhino (Borneo rhino) (Dicerorhinus sumatrensis) in wallow, Tabin Reserve, Sabah, Borneo, Malaysia, Southeast Asia, Asia

Verreaux's Sifaka (Propithecus verreauxi) feeding on spiny Alluaudia sp., Spiny Forest, Berenty Reserve, Southern Madagascar, Africa

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

Grey-breasted spurfowl (gray-breasted spurfowl) (grey-breasted francoli) (gray-breasted francolin) (Francolinus rufopictus), Serengeti National Park, Tanzania, East Africa, Africa

Grey-breasted spurfowl (gray-breasted spurfowl) (grey-breasted francoli) (gray-breasted francolin) (Francolinus rufopictus), Serengeti National Park, Tanzania, East Africa, Africa

Two vervet monkeys (Chlorocebus aethiops) playing, Serengeti National Park, Tanzania, East Africa, Africa

Leopard (Panthera pardus) carrying a warthog, Serengeti National Park, Tanzania, East Africa, Africa

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

A cowboy wrangler leads a pack train of horses up the South Kaibab Trail in Grand Canyon National Park, UNESCO World Heritage Site, Arizona, 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.