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Nurse shark (Ginglymostoma cirratum), with boat in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Tarpon (Megalops atlaticus), underwater at feeding station inside the Mesoamerican Barrier Reef, Belize

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

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

Green sea turtle (Chelonia mydas), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Brassy chubs (Kyphosus vaigiensis), being fed by boat operators inside the Mesoamerican Barrier Reef, Belize

Adult sea otter (Enhydra lutris kenyoni) in kelp bed in Inian Pass, Southeastern Alaska, United States of America

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

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

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

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

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

Adult humpback whale (Megaptera novaeangliae) tail throw among feeding whales in Southeast Alaska, United States of America

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

An adult Pacific white-sided dolphin (Lagenorhynchus obliquidens) bow-riding in Johnstone Strait, British Columbia, Canada

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

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

Aerial drone above view of a kayak on the turquoise water of Mediterranean Sea, Sardinia, Italy, Mediterranean, Europe

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

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

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

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

Adult humpback whale (Megaptera novaeangliae) tail throw among feeding whales in Southeast Alaska, United States of America

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

Adult humpback whale (Megaptera novaeangliae) tail throw among feeding whales in Southeast Alaska, United States of America

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

Manta Birstris showing cleaning station activity. Observations part of project elasmo, conservation project in Ecuador.

Manta Birstris showing cleaning station activity. Observations part of porject elasmo, conservation project in Ecuador.

Manta Birstris showing cleaning station activity. Observations part of project elasmo, conservation project in Ecuador.

Manta Birstris showing cleaning station activity. Observations part of porject elasmo, conservation project in Ecuador.

Manta Birstris showing cleaning station activity. Observations part of porject elasmo, conservation project in Ecuador.

French angelfish, Pomacanthus paru, Ilha rata, Fernando de Noronha national marine sanctuary, Pernambuco, Brazil (S. Atlantic)

Pennant butterflyfish, juvenile, schooling Heniochus diphreutes, Portlock, Oahu, Hawaii (N. Pacific).

Skin diver strokes Sperm Whale, Physeter macrocephalus, Caribbean Sea, Dominica, Leeward Antilles, Lesser Antilles, Antilles, Carribean, West Indies, Central America, North America

Sperm Whale and Skin diver, Physeter macrocephalus, Caribbean Sea, Dominica, Leeward Antilles, Lesser Antilles, Antilles, Carribean, West Indies, Central America, North America

Invasive Lionfish speared by Diver, Pterois volitans, Caribbean Sea, Dominica, Leeward Antilles, Lesser Antilles, Antilles, Carribean, West Indies, Central America, North America

Sperm Whale and Skin diver, Physeter macrocephalus, Caribbean Sea, Dominica, Leeward Antilles, Lesser Antilles, Antilles, Carribean, West Indies, Central America, North America

Diver and Belugas, White whales (Delphinapterus leucas), ice-diving in White Sea, Karelia, north Russia, Arctic

Diver and Belugas, White whales (Delphinapterus leucas), ice-diving in White Sea, Karelia, north Russia, Arctic

Diver and Belugas, White whales (Delphinapterus leucas), ice-diving in White Sea, Karelia, north Russia, Arctic