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Colourful long tail boat in Ko Lipe, in Tarutao National Marine Park, Thailand, Southeast Asia, Asia

Longtail boats on Sunrise Beach on Ko Lipe in Tarutao National Marine Park, Thailand, Southeast Asia, Asia

Long tail boats on Ko Rawi island in Tarutao Marine National Park, in Thailand, Southeast Asia, Asia

Long tail boats on Ko Rawi island in Tarutao Marine National Park, in Thailand, Southeast Asia, Asia

California sea lions (Zalophus californianus), hauled out in Monterey Bay National Marine Sanctuary, California, United States of America, North America

View of Golden Gate Bridge and Fort Point from Marine Drive, San Francisco, California, United States of America, North America

A pod of transient killer whales (Orcinus orca), near a whale watching boat in Monterey Bay Marine Sanctuary, California, United States of America, North America

Transient type killer whale (Orcinus orca), spy-hopping near boat in Monterey Bay National Marine Sanctuary, California, United States of America, North America

Ultramar ferry boat arriving at Isla Mujeres, Caribbean Coast, Cancun, Quintana Roo, Mexico, North America

Vehicle ferry crossing River Dart estuary from Dartmouth to KIngswear, Devon, England, United Kingdom, Europe

Early morning fog in Monterey Harbor, Monterey Bay National Marine Sanctuary, California, United States of America, North America

People canoeing near Tham Law (tube cove), Ao Phang-Nga Marine Park, Phang Nga province, Thailand, Southeast Asia, Asia

Transient type killer whale (Orcinus orca), surfacing near boat in Monterey Bay National Marine Sanctuary, California, United States of America, North America

The commercial fishing purse-seiner Invincible in Monterey Bay National Marine Sanctuary, California, United States of America, North America

Transient killer whale (Orcinus orca) near boat in the Monterey Bay National Marine Sanctuary, California, United States of America, North America

People in kayaks setting off to look for whales at dawn on the St. Lawrence River in the Marine Park of the Saguenay Saint-Laurent, Les Bergeronnes, Quebec Canada, North America

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

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

National Geographic photographer Joel Sartore and his wife Kathy kayaking with a leopard seal near Danco Island, Antarctica

A group of seven adult humpback whales (Megaptera novaeangliae) feeding in Tenakee Inlet on Chichagof Island in Southeast Alaska, USA, Pacific Ocean

Blue whale (balaenoptera musculus) A blue whale passes underneath tourists in a small boat. The Gulf of California.

Gray whale (eschrictius robustus) A gray whale sticks the top of its head out of the water beside a boat. Pacific Mexico.

Blue whale (balaenoptera musculus) A blue whale passes underneath tourists in a small boat. The Gulf of California.

Blue whale (balaenoptera musculus) A blue whale raises its tail alongside a tourist in a small boat.The Gulf of California.

Short-finned Pilot Whale (Globicephala macrorhynchus) & whale-watchers. It is by law that whale watchers should stay at least 50meters (150 feet) away from large whales, including Pilot Whale (in picture here). Unless special in-water permits are given, snorkelers can only swim with smaller dolphins, but not big whales. Azores, Portugal, Atlantic.

Scientists and graduate student collecting hammerhead shark pups for research, Hawaii Institute of Marine Biology, Kaneohe, Oahu, Hawaii, United States of America, Pacific

An adult humpback whale (Megaptera novaeangliae) head-lunging off Point Adolphus in Icy Strait in Southeast Alaska, USA. Pacific Ocean

National Geographic photographer Joel Sartore and his wife Kathy kayaking with a leopard seal near Danco Island, Antarctica

National Geographic photographer Joel Sartore and his wife Kathy kayaking with a leopard seal near Danco Island, Antarctica

National Geographic photographer Joel Sartore and his wife Kathy kayaking with a leopard seal near Danco Island, Antarctica

A pod of approximately 200 melon-headed whales (Peponocephala electra) encountered off the island of Brava, Cape Verde Islands, in the north Atlantic 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

Sperm whale (physeter macrocephalus) A sperm whale under a whale watching boat and tourist. The Gulf of California.

National Geographic photographer Joel Sartore and his wife Kathy kayaking with a leopard seal near Danco Island, Antarctica

National Geographic photographer Joel Sartore and his wife Kathy kayaking with a leopard seal near Danco Island, Antarctica

Hawaiian Spinner Dolphin (Stenella longirostris) spinning with young boaters off the coast of Maui, Hawaii, USA. Pacific Ocean

National Geographic photographer Joel Sartore and his wife Kathy kayaking with a leopard seal near Danco Island, Antarctica

Offshore type bottlenose dolphins (Tursiops truncatus) bow-riding in the midriff region of the Gulf of California (Sea of Cortez), Baja California Norte, Mexico.

Guests from the Lindblad Expedition ship National Geographic Endeavour kayaking with Adelie penguins on icebergs in and around the Antarctic Peninsula

Hawaiian Spinner Dolphin (Stenella longirostris) spinning with young boaters off the coast of Maui, Hawaii, USA. Pacific Ocean

Hawaiian Spinner Dolphin (Stenella longirostris) spinning with young boaters off the coast of Maui, Hawaii, USA. Pacific Ocean

Curious northern (Steller) sea lion (Eumetopias jubatus) colony in Inian Pass near Cross Sound, southeastern Alaska

Antarctic fur seal pup (Arctocephalus gazella) with the National Geographic Explorer at Grytviken Bay, South Georgia, Southern Ocean

Blue whale (balaenoptera musculus) A blue whale researcher watches a whale pass by.The Gulf of California.

Hawaiian Spinner Dolphin (Stenella longirostris) spinning with young boaters off the coast of Maui, Hawaii, USA. Pacific Ocean

Offshore type bottlenose dolphins (Tursiops truncatus) bow-riding in the midriff region of the Gulf of California (Sea of Cortez), Baja California Norte, Mexico.

A group of seven adult humpback whales (Megaptera novaeangliae) feeding in Tenakee Inlet on Chichagof Island in Southeast Alaska, USA, Pacific Ocean

Crabeater seals (Lobodon carcinophaga) swimming along or hauled out on fast ice floe in Bourgeois Fjord near the Antarctic Peninsula

A group of seven adult humpback whales (Megaptera novaeangliae) feeding in Tenakee Inlet on Chichagof Island in Southeast Alaska, USA, Pacific Ocean

Hawaiian Spinner Dolphin (Stenella longirostris) spinning with young boaters off the coast of Maui, Hawaii, USA. Pacific Ocean

A group of seven adult humpback whales (Megaptera novaeangliae) feeding in Tenakee Inlet on Chichagof Island in Southeast Alaska, USA, Pacific Ocean

Hawaiian Spinner Dolphin (Stenella longirostris) spinning with young boaters off the coast of Maui, Hawaii, USA. Pacific Ocean

Crabeater seals (Lobodon carcinophaga) swimming along or hauled out on fast ice floe in Bourgeois Fjord near the Antarctic Peninsula

Crabeater seals (Lobodon carcinophaga) swimming along or hauled out on fast ice floe in Bourgeois Fjord near the Antarctic Peninsula