Curious king penguin (Aptenodytes patagonicus) at breeding and nesting colony at Salisbury Plain in the Bay of Isles, South Georgia, Southern Ocean, Polar Regions

Adult Peale's Dolphin (Lagenorhynchus australis) bow-riding Zodiacs on New Island in the Falkland Islands

Southern right whale (Eubalaena australis) mother surfacing near whale watching boat in Argentina, South America

A commercial whale watching boat being launched at the beach at low tide in Puerto Pyramides, Golfo Nuevo, Argentina, South America

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

View of Hiroshima Castle, with museum, reflecting in Moat, Motomachi, Naka Ward, Hiroshima, Honshu, Japan

View of Bamboo walkway, Sagatenryuji Tateishicho, Ukyo Ward, Kyoto, Honshu, Japan

Southern elephant seal (Mirounga leonina) challenger bull in the surf at Gold Harbour on South Georgia Island, Polar Regions

Hoatzin (Ophisthocomus hoazin) perching on branch by Lake Sandoval, Tambopata National Reserve, Puerto Maldonado, Madre de Dios, Peru, South 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

Guide serving an infusion of Artemisia picked in the Shaumeri Wildlife Reserve, Jordan, Middle East

Chinstrap penguin (Pygoscelis antarctica) breeding colony at Baily Head on Deception Island, Antarctica, Southern Ocean, Polar Regions

Adult gentoo penguin (Pygoscelis papua) with minutes-old newly hatched chick at Gold Harbor on South Georgia

Adult black-legged kittiwakes (Rissa tridactyla) resting on ice in the Svalbard Archipelago, Barents Sea, Norway, Arctic, Europe

Guests from the Lindblad Expedition ship National Geographic Explorer kayaking in the Svalbard Archipelago, Norway, Arctic, Europe

View of Oslo city skyline from The Fram Museum, Bygdoynesveien, Oslo, Norway, Scandinavia, Europe

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

Elephants in Moremi National Park, Botswana

Mother elephant and calf in woodland in Moremi National Park, Botswana

A mixed Black Browed Albatross (Thalassarche melanophris) and Rockhopper Penguins (Eudyptes chrysocome) nesting colony on Westpoint island in the Falkland Islands off Argentina, in South America, being watched by a group on a wildlife tourist trip.

King Penguins on Salisbury Plain, South Georgia, with passengers from an expedition cruise.

Antarctic fur seal baby (Arctocephalus gazella) interacting with a photographer, Stromness Bay in South Georgia

King Penguins at Gold Harbour, South Georgia, with passengers from an expedition cruise.

King Penguins at Gold Harbour, South Georgia, with passengers from an expedition cruise.

Thrill seekers experience cage diving with Galapagos sharks, Carcharhinus galapagensis, North shore, Oahu, Hawaii, USA

Whitetip reef shark, Triaenodon obesus, Namu atoll, Marshall Islands (N. Pacific).

Red (Lace) coral, Distichopora violacea, feather stars, and juvenile gray reef shark, Carcharhinus amblyrhynchos, Ailuk atoll, Marshall Islands, Pacific

Young woman on safari jeep at Udawalawe National Park, Sri Lanka

A diver swims between a sperm whale (Physeter macrocephalus) and her cub in the waters of the Caribbean island of Dominica.

Two teenagers sitting on an Asian Elephant (Elephas maximus), being sprayed with water from the trunk, Kanchanaburi, Thailand, Asia

African elephant (Loxodonta africana), silhouette at sunset, Nxai Pan, Nxai Pan National Park, Botswana, Africa

Young woman snorkeling with a school of fish, Water Cay, Utila, Honduras

Snorkeling in Shark Alley and Hol Chan Marine Reserve, Ambergris Cay, Belize

Hawaii, Maui, Atlantis Submarine passes small coral bed with sea life.