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A curious young polar bear (Ursus maritimus), approaches the ship on Spitsbergen in the Svalbard Archipelago, Norway

A mother polar bear (Ursus maritimus), and cub of the year leaving a fin whale carcass in Holmabukta in the Svalbard Archipelago, Norway

Mother polar bear (Ursus maritimus) and cub-of-the-year disputing then allowing a male bear to feed on a fin whale, Svalbard Archipelago, Norway

Adult polar bear (Ursus maritimus), on multi-year ice floes off the coast of Edgeoya, Svalbard, Norway

Mother polar bear (Ursus maritimus), with cub of the year in Holmabukta in the Svalbard Archipelago, Norway

Adult male hooded seal (Cystophora cristata) hauled out on pack-ice in seasof Denmark Strait, between Iceland and Greenland

Mountain Gorillas in Bwindi Impenetrable Forest National Park, UNESCO World Heritage Site, Uganda, East Africa, Africa

Lioness (Panthera leo), Ngorongoro crater, Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Curious Steller sea lions (Eumetopias jubatus), South Marble Islands, Glacier Bay National Park, UNESCO World Heritage Site, Alaska, United States of America, North America

Rocky mountain bighorn sheep (Ovis canadensis) lamb on a wintry mountain, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Rocky mountain bighorn rams (ovis canadensis) during the rut (mating) season, Jasper National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Pinnacle Rock, a volcanic plug on Bartolome Island, one of the most spectacular features of the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Champion Islet and Cormorant Point, Floreana Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Blue-footed boobies (Sula nebouxii) plunge-diving for small fish at sunset off Rabida Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Perito Moreno Glacier, UNESCO World Heritage Site, around El Calafate, Santa Cruz province, Patagonia, Argentina, South America

A sleek blue shark (Prionace glauca) cruises through the cold waters off Cape Cod, Massachusetts, in the Atlantic Ocean. These beautiful elasmobranchs are found throughout the world in both temperate and tropical seas and are a species listed as Near Thre

Sheep in tidal marsh at Mont-Saint-Michel bay with Abbey in the background, UNESCO World Heritage Site, Manche department, Normandy region, France, Europe

A close up view of Lamplugh Glacier in Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

A view in Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Adult surf scoters (Melanitta perspicillata) in flight in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, Pacific Ocean, United States of America, North America

The top floor of the historic Watchtower at Grand Canyon South Rim, UNESCO World Heritage Site, Arizona, United States of America, North America

Pico Viejo, Caldeira de las Canadas, Mount Teide, Mount Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic Ocean, Europe

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

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on Genovesa (Tower) Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Great frigatebird (Fregata minor) in flight near guests on North Seymour Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Wild Galapagos giant tortoise (Geochelone elephantopus) at Urbina Bay, Isabela Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Schooling yellow-tailed surgeonfish (Prionurus punctatus), underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult black-necked stilt (Himantopus mexicanus) wading and feeding in a brackish water lagoon on Floreana Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Scenic view of Leon Dormido (Sleeping Lion) Island off San Cristobal Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Lava lizard (Microlophus spp) in the Galapagos Islands Archipelago, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) feeding on fish at the Puerto Ayora fish market, Santa Cruz Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) feeding on fish at the Puerto Ayora fish market, Santa Cruz Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos fur seal (Arctocephalus galapagoensis) hauled out on lava flow in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult great blue heron (Ardea herodias cognata) feeding on green sea turtle hatchlings, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult great blue heron (Ardea herodias cognata) feeding on green sea turtle hatchlings, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult great blue heron (Ardea herodias cognata) feeding on green sea turtle hatchlings, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult great blue heron (Ardea herodias cognata) feeding on green sea turtle hatchlings, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Spotted eagle rays (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Spotted eagle ray (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Juvenile Galapagos hawk (Buteo galapagoensis) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Juvenile Galapagos hawk (Buteo galapagoensis) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult yellow warbler (Dendroica petechia aureola) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult yellow warbler (Dendroica petechia aureola) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult striated Heron (Butorides striata) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The very colorful Galapagos land iguana (Conolophus subcristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The very colorful Galapagos land iguana (Conolophus subcristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Scene of the fish market in the port town of Puerto Ayora, Santa Cruz Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Galapagos brown pelican (Pelecanus occidentalis urinator) feeding in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecaudor, South America

Male Great frigatebird (Fregata minor) in breeding plumage with greenish metalic sheen to feathers) North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on Genovesa (Tower) Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on Genovesa (Tower) Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on Genovesa (Tower) Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Greater flamingos (Phoenicopterus ruber) foraging for small pink shrimp in saltwater lagoon in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Greater flamingos (Phoenicopterus ruber) foraging for small pink shrimp in saltwater lagoon in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Greater flamingos (Phoenicopterus ruber) foraging for small pink shrimp in saltwater lagoon in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Galapagos penguin (Spheniscus mendiculus) feeding underwater on small baitfish in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Galapagos penguin (Spheniscus mendiculus) feeding underwater on small baitfish in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult Nazca booby (Sula grantii) pair in courtship in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Nazca booby (Sula grantii) downy chick in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult red-footed booby (Sula sula) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult red-footed booby (Sula sula) being attacked in flight by a great frigatebird (Fregata minor) in the Galapagos, UNESCO World Heritage Site, Ecuador, South America

Blue-footed booby (Sula nebouxii) courtship behavior in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult red-footed booby (Sula sula) in flight in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult red-footed booby (Sula sula) being attacked in flight by a great frigatebird (Fregata minor) in the Galapagos, UNESCO World Heritage Site, Ecuador, South America

Galapagos penguin (Spheniscus mendiculus) feeding underwater on small baitfish in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult red-footed booby (Sula sula) at sunset in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult red-footed booby (Sula sula) head detail in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

An adult Galapagos dove (Zenaida galapagoensis) on Espanola Island in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lion (Zalophus wollebaeki) mother and pup on San Cristobal Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lion mother nursing pup (Zalophus wollebaeki) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lion pup (Zalophus wollebaeki) on Gardner Beach, Espanola Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lions (Zalophus wollebaeki) hauled out on Gardner Beach, Espanola Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Snorkelers with Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult red-footed booby (Sula sula) returning to the nest site with nest building material in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Snorkeler with Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion bulls (Zalophus wollebaeki) mock-fighting in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lion (Zalophus wollebaeki) pup inspects a fishing boat on the beach on San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lion (Zalophus wollebaeki) pup takes over a small fishing boat on Isabela Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Guests from the Lindblad Expeditions ship National Geographic Sea Bird in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

The Lindblad Expeditions ship National Geographic Sea Bird operating in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Little boat between the icebergs of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Fish trawler between the icebergs of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

View over the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Little boat between the icebergs of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Floating icebergs, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Floating icebergs, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Floating icebergs, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Little boat between the icebergs of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Aerial of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Humpback whales, floating icebergs, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions