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A banded sea snake (Laticauda colubrina) swims at the surface in Wakatobi National Park, Indonesia. This is one of the most venomous snakes in the world.

A beautiful coral reef, dominated by colorful gorgonians, grows along the edge of the Blue Hole in Lighthouse Reef in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.

A beautiful coral reef, dominated by colorful gorgonians, grows along the edge of the Blue Hole in Lighthouse Reef in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.

A young humpback whale, Megaptera novaeangliae, breaches out of the blue waters of the Caribbean Sea.

A humpback whale, Megaptera novaeangliae, raises its powerful fluke out of the blue waters of the Caribbean Sea and slams it down on the surface to communicate.

A humpback whale, Megaptera novaeangliae, raises its powerful fluke out of the blue waters of the Caribbean Sea and slams it down on the surface to communicate.

Discarded plastic bags and other trash float above a shallow coral reef in Raja Ampat, Indonesia. Plastics have become a major pollution problem worldwide.

A beautiful coral reef thrives in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for both its amazing marine biodiversity as well its infamous dragons.

A Florida manatee, Trichechus manatus latirostris, rises to the surface of Crystal River, Florida. This endangered sirenian subspecies migrates to inland rivers during the winter where water temperatures are warmer than the ocean.

A huge whale shark, Rhincodon typus, swims in sunlit Indonesian waters. This massive yet harmless shark feeds on planktonic organisms and can sometimes be found swimming near fishing platforms due to the scent of fish.

A huge whale shark, Rhincodon typus, swims in sunlit Indonesian waters. This massive yet harmless shark feeds on planktonic organisms and can sometimes be found swimming near fishing platforms due to the scent of fish.

Detail of a reef-building coral colony growing on a healthy reef in Komodo National Park, Indonesia.

Adult bull southern elephant seal (Mirounga leonina) trying to cool off by flinging sand on his back at Gold Harbour, South Georgia, Polar Regions

Black-legged kittiwake (Rissa tridactyla) feeding on small fish in Tracy Arm, Southeast Alaska, United States of America, North America

Adult humpback whale (Megaptera novaeangliae) flukes-up dive in Inian Pass, Southeast Alaska, Pacific Ocean, United States of America, North America

Humpback whale (Megaptera novaeangliae), surfacing off Half Moon Island in the South Shetland Island Group, Antarctica, Polar Regions

New Zealand Fur Seal Stretching on White Rock Surface Under Blue Sky at Kaikoura Peninsula, New Zealand

Guadalupe fur seal (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Adult wandering albatross (Diomedea exulans) on the wing near the Antarctic Peninsula, Southern Ocean, Polar Regions

Adult Weddell seal (Leptonychotes weddellii) hauled out on ice near the Antarctic Peninsula, Southern Ocean, Polar Regions

View of sea and coastline from Anacapri panorama view point, Anacapri, Isle of Capri, Bay of Naples, Campania, Italy, Mediterranean, Europe

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

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

Adult California gray whale (Eschrictius robustus), spy-hopping in San Ignacio Lagoon, Baja California, Mexico, North America

Adult California gray whale (Eschrictius robustus), spy-hopping in San Ignacio Lagoon, Baja California, Mexico, North America

Adult California gray whale (Eschrictius robustus), surfacing near boat in San Ignacio Lagoon, Baja California, Mexico, North America

California gray whale calf (Eschrictius robustus), surfacing in San Ignacio Lagoon, Baja California, Mexico, North America

California gray whale calf (Eschrictius robustus), surfacing in San Ignacio Lagoon, Baja California, Mexico, North America

Bigeye Trevally (Caranx sexfasciatus), schooling in Cabo Pulmo National Marine Park, Baja California Sur, Mexico, North America

Kicker Rock, a volcanic formation near the island of San Cristobal, a popular spot for snorkelling, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Double-crested cormorant (Nannopterum auritum), taking flight, Concepcion Bay, Baja California Sur, Sea of Cortez, Mexico, North America

Eared grebes (Podiceps nigricollis), in Puerto Refugio, Angel de la Guarda Island, Baja California, Sea of Cortez, Mexico, North America

Killer whale pod (Orcinus orca), off Punta Colorada, Isla San Jose, Baja California Sur, Mexico, North America

Killer whale pod (Orcinus orca), off Punta Colorada, Isla San Jose, Baja California Sur, Mexico, North America

Killer whale pod (Orcinus orca), off Punta Colorada, Isla San Jose, Baja California Sur, Mexico, North America

Killer whale female (Orcinus orca), tail-lobbing off Isla San Lorenzo, Baja California, Sea of Cortez, Mexico, North America

Killer whale female (Orcinus orca), tail-lobbing off Isla San Lorenzo, Baja California, Sea of Cortez, Mexico, North America

A long-beaked common dolphin pod (Delphinus capensis), traveling off Gorda Banks, Baja California Sur, Mexico, North America

A long-beaked common dolphin (Delphinus capensis), surfacing off Gorda Banks, Baja California Sur, Mexico, North America

A long-beaked common dolphin (Delphinus capensis), surfacing off Gorda Banks, Baja California Sur, Mexico, North America

A long-beaked common dolphin (Delphinus capensis), surfacing off Gorda Banks, Baja California Sur, Mexico, North America

A long-beaked common dolphin (Delphinus capensis), surfacing off Gorda Banks, Baja California Sur, Mexico, North America

Adult brown pelicans (Pelecanus occidentalis), plunge diving for fish, Isla Carmen, Baja California Sur, Mexico, North America

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

West Indian manatee (Trichechus manatus), on the sand near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in Southeast Alaska, United States of America

Adult fin whale (Balaenoptera physalus) sub-surface feeding in the rich waters off the Svalbard Archipelago, Norway

A rare sighting of an adult blue whale (Balaenoptera musculus) sub-surface feeding in the Svalbard Archipelago, Norway

Adult fin whale (Balaenoptera physalus) sub-surface feeding in the rich waters off the Svalbard Archipelago, Norway

Adult common (northern) minke whale (Balaenoptera acutorostrata) sub-surface feeding in the Svalbard Archipelago, Norway

A rare sighting of an adult blue whale (Balaenoptera musculus) sub-surface feeding in the Svalbard Archipelago, Norway

A rare sighting of an adult blue whale (Balaenoptera musculus) sub-surface feeding in the Svalbard Archipelago, Norway

Adult bearded seal (Erignathus barbatus) swimming amongst the ice in the Svalbard Archipelago, Norway

Adult bearded seal (Erignathus barbatus) swimming amongst the ice in the Svalbard Archipelago, Norway

Adult white-beaked dolphin (Lagenorhynchus albirostris) surfacing in the Svalbard Archipelago, Norway

Adult white-beaked dolphin (Lagenorhynchus albirostris) surfacing in the Svalbard Archipelago, Norway

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

Humpback whale (Megaptera novaeangliae), feeding at the surface, Alert Bay, Inside Passage, British Columbia, Canada, North America

Young whale shark (Rhincodon typus), filter feeding near the surface at El Mogote, Baja California Sur, Mexico, North America

Young whale shark (Rhincodon typus), filter feeding near the surface at El Mogote, Baja California Sur, Mexico, North America

Killer whale pod (Orcinus orca), off Punta Colorada, Isla San Jose, Baja California Sur, Mexico, North America

Killer whale pod (Orcinus orca), off Punta Colorada, Isla San Jose, Baja California Sur, Mexico, North America