A closeup of an adult humpback's pectoral fin as it waves in the air, Ha’apai, Tonga

A closeup view of the underjaw of an adult humpback. The tubercles are clearly visible, Ha’apai, Tonga

Adult humpback whale breaching, Ha'apai, Tonga

Adult male humpbacks sing complex songs during the breeding and migration times, Ha'apai, Tonga

Adult male humpback whale spy hopping and showing deep throat pleats, Ha'apai, Tonga

An adult humpback resting just below the surface, Ha’apai, Tonga

A school of Moorish Idols cruise over the reef, Ha'apai, Tonga

Atlantic cod (Gadus morhua), Ålesund Aquarium, Norway

Atlantic cod (Gadus morhua), Ålesund Aquarium, Norway

A view from behind of a humpback swimming, Ha'apai, Tonga

A view of the ventral keel and genital area of a female humpback whale. The two mammary slits are visible on either side of the genital slit, Ha’apai, Tonga

Banded sea snake breathing at surface, Ha'apai, Tonga

Black diadema sea urchin (Diadema antillarum), Mu Ko Lanta Marine National Park, Thailand

Brain coral, Mu Ko Lanta Marine National Park, Thailand

Brain coral, partly damaged from illegal anchoring, Mu Ko Lanta Marine National Park, Thailand

Cleaning the shores of North-West-Spitsbergen 2015, Svalbard

Cleaning the shores of Spitsbergen, Svalbard, 2015

Closeup of humpback calf swimming with mother in the background, Ha’apai Islands, Tonga

Closeup of juvenile humpback whale blowholes, Ha’apai, Tonga

Coastal tropical forest, Mu Ko Lanta Marine National Park, Thailand

Coastal tropical forest, Mu Ko Lanta Marine National Park, Thailand

Coastal tropical forest, Mu Ko Lanta Marine National Park, Thailand

Coastline, Vanuatu

Common clownfish (Amphiprion ocellaris) in sea anemone (Heteractis magnifica), Mu Ko Lanta Marine National Park, Thailand

Common clownfish (Amphiprion ocellaris) in sea anemone (Heteractis magnifica), Mu Ko Lanta Marine National Park, Thailand

Coral reef, Mu Ko Lanta Marine National Park, Thailand

Coral reef, Mu Ko Lanta Marine National Park, Thailand

Coral reef, Mu Ko Lanta Marine National Park, Thailand

Coral reef, Mu Ko Lanta Marine National Park, Thailand

Coral reef, Mu Ko Lanta Marine National Park, Thailand

Coral reef, Mu Ko Lanta Marine National Park, Thailand

Coral reef, Mu Ko Lanta Marine National Park, Thailand

Coral reef, Mu Ko Lanta Marine National Park, Thailand

Coral reef, Mu Ko Lanta Marine National Park, Thailand

Coral, Vanuatu

Crab-eating Macaque (Macaca fascicularis) in mangroves of the Mu Ko Lanta Marine National Park, Thailand

Crab-eating Macaques (Macaca fascicularis) in mangroves of the Mu Ko Lanta Marine National Park, Thailand

Crab-eating Macaques (Macaca fascicularis) in mangroves of the Mu Ko Lanta Marine National Park, Thailand

Education trail of coastal tropical forest, Mu Ko Lanta Marine National Park, Thailand

Fisherboat passes mangrove forest at Ko Lanta, Thailand

Fishfarm within mangrove forest of Ko Lanta, Thailand

Fluted giant clam (Tridacna squamosa) in between coral, Mu Ko Lanta Marine National Park, Thailand

Fluted giant clam (Tridacna squamosa) in between coral, Mu Ko Lanta Marine National Park, Thailand

Fluted giant clam (Tridacna squamosa) in between coral, Mu Ko Lanta Marine National Park, Thailand

Fluted giant clam (Tridacna squamosa) in between coral, Mu Ko Lanta Marine National Park, Thailand

Garbage at the beach of Phippsøya, Seven Islands, Svalbard

Giant moray (Gymnothorax javanicus), Similan Island National Park, Thailand

Green algae, coral reef, Mu Ko Lanta Marine National Park, Thailand

Greenish sea cucumber (Stichopus chloronotus), Mu Ko Lanta Marine National Park, Thailand

Humpback whale calf feeding, Ha'apai, Tonga

Humpback whale calf, Ha'apai, Tonga

Humpback whale calf, Ha'apai, Tonga

Humpback whale calves, Ha'apai, Tonga

Humpback whale diving, Ha'apai, Tonga

Humpback whale migration, Ha'apai, Tonga

Humpback whale mother and calf, Ha'apai Islands, Tonga

Humpback whale mother and calf, Ha'apai, Tonga

Humpback whale mother and calf, Ha'apai, Tonga

Humpback whales, Ha'apai, Tonga

Ko Haa Islands, Mu Ko Lanta Marine National Park, Thailand

Ko Haa Islands, Mu Ko Lanta Marine National Park, Thailand

Ko Haa Islands, Mu Ko Lanta Marine National Park, Thailand

Ko Haa Islands, Mu Ko Lanta Marine National Park, Thailand

Ko Haa Islands, Mu Ko Lanta Marine National Park, Thailand

Ko Haa Islands, Mu Ko Lanta Marine National Park, Thailand

Mooring in coral reef, Mu Ko Lanta Marine National Park, Thailand

Moorish Idols (Zanclus cornutus), Mu Ko Lanta Marine National Park, Thailand

Moorish Idols (Zanclus cornutus), Mu Ko Lanta Marine National Park, Thailand

Mother and calf humpback, Ha'apai Islands, Tonga

Mother and calf humpback, Ha’apai Islands, Tonga

Mu Ko Lanta Marine National Park, Thailand

Mu Ko Lanta Marine National Park, Thailand

Mu Ko Lanta Marine National Park, Thailand

Norwegian spring spawning herrings, Ålesund Aquarium, Norway

Parrothfish (Scaridae), Mu Ko Lanta Marine National Park, Thailand

Parrothfish (Scaridae), Mu Ko Lanta Marine National Park, Thailand

Phippsøya, Seven Islands, Svalbard

Reef fish, Vanuatu

Reef fish, Vanuatu

Reef scene with hard and soft corals and feather stars, Ha'apai, tonga

Sea cucumber (genus Bohadschia), Mu Ko Lanta Marine National Park, Thailand

Sea slug, Vanuatu

Soft coral on deep pinnacle, Ha'apai, Tonga

Stingray, poor knights marine reserve, Northland, New Zealand

The pectoral fin of a humpback can reach 5 metres in length, Ha’apai, Tonga

Titan Triggerfish (Balistoides viridescens) in front of damaged corals, Similan Islands Marine National Park, Thailand

Tomato Anemone fish in blue tip anemone, Ha'apai, Tonga

Traditional Tongan dugout canoe still used for inshore reef fishing, Ha’apai, Tonga

Two adult humpbacks during the mating season, Ha’apai, Tonga

Young adult humpback swimming towards camera, Ha'apai Islands, Tonga

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