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Littered beluga bones left by whalers, Delphinapterus leucas, at Ahlstrandhalvoya, Bellsund, Svalbard, Norway, Scandinavia, Europe

Green sea turtle (Chelonia mydas) underwater with snorkeler, Maui, Hawaii, United States of America, Pacific

Green sea turtle (Chelonia mydas) underwater with snorkeler, Maui, Hawaii, United States of America, Pacific

California gray whale (Eschrichtius robustus) touched by excited whale watcher, San Ignacio Lagoon, Baja California Sur, Mexico, North America

California gray whale (Eschrichtius robustus) and excited whale watchers, San Ignacio Lagoon, Baja California Sur, Mexico, North America

Leatherback turtle (Dermochelys coriacea) eggs being collected for transfer to a safer hatchery location, Shell Beach, Guyana, South America

Researchers measuring a female Leatherback turtle (Dermochelys coriacea) at its nest site, Shell Beach, Guyana, South America

Leatherback turtle (Dermochelys coriacea) eggs being collected for transfer to a safer hatchery location, Shell Beach, Guyana, South America

Whale shark (Rhincodon typus) with rainbow runner observed by a tourist and guide in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourists snorkelling with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourists snorkelling with a whale shark (Rhincodon typu ) in Honda Bay, Puerto Princesa, Palawan, The Philippines, Southeast Asia, Asia

Tourist snorkelling with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourist and tour guide swimming with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourist snorkelling with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Snorkeller swimming with a juvenile whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Tourists snorkelling with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Snorkeller with oceanic manta ray (Manta birostris) feeding near the surface, Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

A group of snorkellers observing spinetail devil rays (Mobula mobular) engaged in sexual courtship in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Snorkellers with an oceanic manta ray (Manta birostris) feeding near the surface, Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Oceanic manta ray (Manta birostris) feeding near the surface, Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Littered beluga bones left by whalers, Delphinapterus leucas, at Ahlstrandhalvoya, Bellsund, Svalbard, Norway, Scandinavia, Europe

Green sea turtle (Chelonia mydas) underwater with snorkeler, Maui, Hawaii, United States of America, Pacific

Spotted eagle ray (Aetobatus narinari) underwater, Leon Dormido Island, San Cristobal Island, Galapagos Islands, Ecuador, South America

Snorkellers observing spinetail devil rays (Mobula mobular) engaged in sexual courtship in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Snorkeller with a juvenile whale shark (Rhincodon typus) feeding on the suface in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Spotted eagle ray (Aetobatus narinari) underwater, Leon Dormido Island, San Cristobal Island, Galapagos Islands, Ecuador, South America

Leatherback turtle (Dermochelys coriacea) laying eggs under the watchful eyes of a conservation worker, Shell Beach, Guyana, South America

Tourist swimming with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Elephant safari in Hurulu Eco Park biosphere reserve, Habarana, Anuradhapura District, Sri Lanka, Asia

California gray whale (Eschrichtius robustus) and excited whale watchers, San Ignacio Lagoon, Baja California Sur, Mexico, North America

Applying a tag to a Leatherback turtle (Dermochelys coriacea) at its nesting site, Shell Beach, Guyana, South America

Turtle warden with nesting Leatherback turtle (Dermochelys coriacea), Shell Beach, Guyana, South America

Tourist swimming with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

California gray whale (Eschrichtius robustus) and excited whale watchers, San Ignacio Lagoon, Baja California Sur, Mexico, North America

Tourists snorkelling with a whale shark (Rhincodon typus) in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Two tourists snorkelling with a whale shark (Rhincodon typus), in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Green sea turtle (Chelonia mydas) underwater with snorkeler, Maui, Hawaii, United States of America, Pacific

California gray whale (Eschrichtius robustus) and excited whale watchers, San Ignacio Lagoon, Baja California Sur, Mexico, North America

Snorkellers with a juvenile whale shark (Rhincodon typus) feeding at the suface in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

California gray whale (Eschrichtius robustus) and excited whale watchers, San Ignacio Lagoon, Baja California Sur, Mexico, North America

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

The main house of the ancient Tusayan Ruins at Grand Canyon South Rim, UNESCO World Heritage Site, Arizona, United States of America, North America

The remains of the camp where Fridtjof Nansen over-wintered with Hjalmar Johansen in 1895-96, Franz Josef Land, Russia, Arctic Ocean, Eurasia

Aerial view taken by drone of iceberg in Jokusarloon Glacier Lagoon during a summer day, Iceland, Polar Regions

Aerial view taken by drone of iceberg in Fjallsjokull Glacier Lagoon during a summer day, Iceland, Polar Regions

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

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

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

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

Footprints of large plant-eating Jurassic Saurapod dinosaurs, an important middle Jurassic find on the north east coast in 2018, Brothers' Point (Rubha nam Brathairean), Trotternish Peninsula, Skye, Inner Hebrides, Scotland, United Kingdom, Europe

The Lindblad Expedition ship National Geographic Explorer near a glacier in the Svalbard Archipelago, Norway, Arctic, Europe

A dawn Zodiac tour of Boatswain Bird Island just off Ascension Island in the southern tropical Atlantic Ocean, South Atlantic Ocean

Tourist vehicle on Tristan da Cunha, the most remote inhabited location on Earth, Tristan da Cunha, South Atlantic Ocean

Views of the abandoned whaling station in Stromness Bay on South Georgia, Southern Ocean, Polar Regions

Grand Canyon, Moran Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon, from Hermit Road, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Near Kirkstone Pass, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

An underwater photographer swims past a large yellow gorgonian fan with a bed of red soft corals beneath it, Fiji.

Scuba diver navigates the waters using a diver propulsion vehicle off the coast of Bonaire, Caribbean Netherlands.

Underwater photographer at the entrance of a cave framed by pink barrel sponges, North Sulawesi, Indonesia.

Great white shark (Carcharodon carcharias) swims by divers in a shark cage, Isla Guadalupe, Baja California, Mexico. The divers are feeding the shark jack mackerel (Trachurus symmetricus).

Hiker on ancient path used by villagers to cross the island North to South, on the heights of Santana, Madeira island, Atlantic Ocean, Portugal

The 11th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

Humpback whale (Megaptera novaeangliae), mother and calf underwater on the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

A car driving along scenic road in Zion National Park on a sunny day, Utah, United States of America

Tourists on boat trip through mangrove fringed Nosara River estuary and Biological Reserve at sunset, Boca Nosara, Nosara, Guanacaste, Costa Rica