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Bluespine unicorn fish (Naso unicornis) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Flightless cormorant (Nannopterum harrisi) hunting underwater, Tagus Cove, Isabela Island, Galapagos Islands, Ecuador, South America

Whale shark (Rhincodon typus) with shoal of fish on the surface), Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Marine Iguana feeding at Sea, Amblyrhynchus cristatus, Cabo Douglas, Fernandina Island, Galapagos, Ecuador

Antarctic fur seal (Arctocephalus gazella) pups underwater in Stromness Bay, South Georgia, South Atlantic Ocean, Polar Regions

California gray whale (Eschrichtius robustus) calf underwater with whale watchers in San Ignacio Lagoon, Baja California Sur, Mexico, North America

Flightless cormorant (Nannopterum harrisi) hunting underwater, Tagus Cove, Isabela Island, Galapagos Islands, Ecuador, South America

California sea lion (Zalophus californianus) underwater with snorkeler at Los Islotes, Baja California Sur, Mexico, North America

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

Bluespine unicorn fish (Naso unicornis) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Giant trevally (Caranx ignobilis) shoal, Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

Glassfish (Parapriacanthus ransonneti) shoal, Ras Mohammed National Park, Sharm el-Sheikh, Red Sea, Egypt, North Africa, Africa

Adult blacktip reef shark (Carcharhinus melanopterus) underwater at Toau, Tuamotus, French Polynesia, South Pacific, Pacific

Colorful reef fish in the inner lagoon at Toau Atoll, Tuamotus, French Polynesia, South Pacific, Pacific

Juvenile whale shark (Rhincodon typus) with a common remora attached in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Bluespine unicorn fish (Naso unicornis) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Yellow-dotted trevally (Carangoides fulvoguttatus) shoal, Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

Orbicular batfish (Platax orbicularis) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Adult California sea lion (Zalophus californianus) underwater at Los Islotes, Baja California Sur, Mexico, North America

Glasseye (Heteropriacanthus cruentatus) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Whale shark (Rhincodon typus), filter feeding underwater off El Mogote, near La Paz, Baja California Sur, Mexico, North America

Whale shark (Rhincodon typus,) filter feeding underwater off El Mogote, near La Paz, Baja California Sur, Mexico, North America

A curious male leopard seal (Hydrurga leptonyx), underwater at Monroe Island, South Orkney Islands, Antarctica, Polar Regions

An adult banded coral shrimp (Stenopus hispidus), on a night snorkel at Arborek Reef, Raja Ampat, Indonesia, Southeast Asia, Asia

A school of big-eye jacks (Caranx sexfasciatus) above a coral reef in the Solomon Islands. This region is known for its healthy fish populations.

Blacktip reef sharks swim just under the surface in the Solomon Islands. This beautiful Melanesian region is known for its spectacular reefs and high marine biodiversity.

A large reef manta ray (Mobula alfredi) swims through clear water in Raja Ampat, Indonesia. This beautiful region is known as the heart of the Coral Triangle and is a popular destination for scuba divers and snorkelers.

Snorkelers swim above a blue hole on Palau's barrier reef. This hole formed when sea level was much lower than it is today.

False clownfish (Amphiprion ocellaris) swim near their host anemone in Alor, Indonesia. This remote region is known for its beautiful reefs and spectacular marine biodiversity.

A Caribbean electric ray (Narcine bancroftii) lays on the sandy seafloor of Turneffe Atoll off the coast of Belize in the Caribbean Sea. This ray can generate strong electric discharges used to defend themselves or to stun prey.

A pair of spotted eagle rays (Aetobatus narinari) swim over the deep, sandy seafloor near Cocos Island, Costa Rica. This remote, Pacific island is famous for its healthy fish and shark populations.

A spotted eagle ray (Aetobatus narinari) swims over the deep, sandy seafloor near Cocos Island, Costa Rica. This remote, Pacific island is famous for its healthy fish and shark populations.

A rare roughsnout ghost pipefish (Solenostomus paegnius) hovers above the seafloor in Komodo National Park, Indonesia. This beautiful area harbors extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

A lionfish (Pterois volitans) displays its venomous spines in Komodo National Park, Indonesia. This tropical area in the western Pacific harbors an extraordinary array of marine organisms.

A spine-cheeked anemonefish (Premnas biaculeatus) swims among the tentacles of its host anemone in Wakatobi National Park, Indonesia.

A lionfish (Pterois volitans) swims along the edge of a beautiful reef in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

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

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

A pink anemonefish (Amphiprion perideraion) swims among the tentacles of its host anemone in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

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 pink anemonefish (Amphiprion perideraion) swims among the tentacles of its host anemone in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

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

A colorful and healthy coral reef thrives in shallow water in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

A broadclub cuttlefish (Sepia latimanus) uses camouflage to blend into a shallow coral reef in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

A blue line grouper (Cephalopholis formosa) swims on a reef in the Lesser Sunda Islands of Indonesia.

A juvenile many-spotted sweetlips (Plectorhinchus chaetodonoides) feeds on a small fish near the seafloor in Lembeh Strait, Indonesia.

A lionfish (Pterois volitans) hunts for prey in a seagrass meadow in the Banda Islands of eastern Indonesia.

A large banded sea snake, Laticauda colubrina, sinuously swims over a beautiful reef in Wakatobi National Park, Indonesia.

An adult male green sea turtle, Chelonia mydas, swims in the dark waters near a reef in Wakatobi National Park, Indonesia.

A large roughtail stingray, Dasyatis centroura, lays on the seagrass-covered seafloor of Turneffe Atoll off the coast of Belize. This reef is part of the massive Mesoamerican Reef System in the Caribbean Sea, the second largest barrier reef on Earth.

A spinner dolphin, Stenella longirostris, gracefully glides through the clear, blue waters of the Pantar Strait near Alor in Indonesia.

A pink anemonefish, Amphiprion perideraion, swims above its beautiful host anemone in Wakatobi National Park, Indonesia.

A large roughtail stingray, Dasyatis centroura, lays on the seagrass-covered seafloor of Turneffe Atoll off the coast of Belize. This reef is part of the massive Mesoamerican Reef System in the Caribbean Sea, the second largest barrier reef on Earth.

Mother and calf humpback whales, Megaptera novaeangliae, swim in the clear, blue waters of the Caribbean Sea.

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

A magnificent humpback whale, Megaptera novaeangliae, swims in the clear, blue waters of the Caribbean Sea.

A magnificent humpback whale, Megaptera novaeangliae, swims in the clear, blue waters of the Caribbean Sea.

An ornate ghost pipefish, Solenostomus paradoxus, hovers near a hydroid on a reef in Raja Ampat, Indonesia.

A false clownfish, Amphiprion ocellaris, swims among the tentacles of its host anemone in Raja Ampat, Indonesia.

A school of lined sweetlips, Plectorhinchus lineatus, swim above a healthy coral reef in Raja Ampat, Indonesia.

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 hawksbill sea turtle, Eretmochelys imbricata, swims over a beautiful reef 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 hawksbill sea turtle, Eretmochelys imbricata, lays on a beautiful reef 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.