Jurgen Freund / Bleached Staghorn corals (Acropora cervicornis), Great Barrier Reef, Australia, 2017.

Jurgen Freund / Timelapse of Giant sea cucumbers (Thelenota ananas) moving underwater, with a Giant clam (Tridacna gigas) in the background, Great Barrier Reef, Queensland, Australia, 2015.

Brandon Cole / Pink anemonefish (Amphiprion perideraion) lives in symbiotic association with Magnificent sea anemone (Heteractis magnifica) Great Barrier Reef, Australia, Pacific Ocean

Jurgen Freund / Blue and yellow fusiliers (Caesio teres) shoal, Great Barrier Reef, Queensland, Australia.

Jurgen Freund / Chambered nautilus (Nautilus pompilius) with red whip coral. Osprey Reef, Great Barrier Reef, Queensland, Australia.

Brandon Cole / Two Olive-brown sea snakes (Aipysurus laevis) interacting, venomous species. Great Barrier Reef, Australia, Pacific Ocean. Noevmber.

Mark MacEwen / Wedge-tailed Shearwaters (Puffinus pacificus) at night, Heron Island, southern Great Barrier Reef, Queensland, Australia. Taken with infra-red camera.

Ingo Arndt / Aerial view of Hardy Reef, Great Barrier Reef, Queensland, Australia, December 2010.

Ingo Arndt / Aerial view of Hardy Reef, Great Barrier Reef, Queensland, Australia, December 2010.

Jurgen Freund,Jurgen Freund / Flexible Leather Coral (Sinularia flexibilis) spawning during the annual mass coral spawning event, in November, Great Barrier Reef, Queensland, Australia

Jurgen Freund,Jurgen Freund / Non-diver tourists surrounded by fish, trying out the sea walker from the Sunlover Pontoon, Great Barrier Reef, Queenland, Australia, November 2012

Jurgen Freund,Jurgen Freund / Fluorescent corals (Trachyphyllia geoffroyi) Great Barrier Reef, Australia

Jurgen Freund / Fluorescent corals (Favia sp) Great Barrier Reef, Australia

Jurgen Freund,Jurgen Freund / Aerial view of Hardy Reef with float planes, Great Barrier Reef, Australia, August 2011

Inaki Relanzon / Whitsunday Islands, aerial view, Great Barrier Coral Reef, Queensland, Australia, October 2011.

Inaki Relanzon / Whitsunday Islands, aerial view, Great Barrier Coral Reef, Queensland, Australia, October 2011.

Inaki Relanzon / Whitsunday Islands, aerial view with hydroplane landing, Great Barrier Coral Reef, Queensland, Australia, October 2011.

Mark Carwardine / Tail flippers of Dwarf minke whale, thought to form a yet-to-be named sub-species of the Common minke whale {Balaenoptera acutorostrata}, Ribbon Reefs, Great Barrier Reef, Queensland, Australia

Mark Carwardine / Dwarf minke whale, thought to form a yet-to-be named sub-species of the Common minke whale {Balaenoptera acutorostrata}, Ribbon Reefs, Great Barrier Reef, Queensland, Australia

Mark Carwardine / Rear view of Dwarf minke whale, thought to form a yet-to-be named sub-species of the Common minke whale {Balaenoptera acutorostrata}, Ribbon Reefs, Great Barrier Reef, Queensland, Australia

Jurgen Freund / Fred Gurgel organizing his algae / seaweed specimens, as part of the Coral Reef census, Lizard Island, Queensland, Australia, April 2008

Jurgen Freund / Jo Browne and Kade Mills use a cylinder cone shaped plankton net to sample gelatinous zooplankton for Coral Reef census, Lizard Island, Queensland, Australia, April 2008. Not released.

Jurgen Freund / Invertebrate specimens for the Barcode of Life project of French scientist Laetitia Plaisance as part of the Coral Reef census, Lizard Island, Queensland, Australia, April 2008

Jurgen Freund / Split level of mangrove roots exposed at low tide, Lizard Island, Queensland, Australia, April 2008

Jurgen Freund / Charlotte Watson snorkels down to collect sand which may contain polychaete worms, Coral Reef census, Lizard Island, Queensland, Australia, April 2008. Model released

Jurgen Freund / Coral spawning in the Great Barrier Reef happens every year in November 3 - 5 days after full moon, Great Barrier Reef, Queensland, Australia

Jurgen Freund / Aerial view of the Great Barrier Reef, Queensland, Australia

Jurgen Freund / Aerial view of Green Island, on the Great Barrier Reef, Queensland, Australia

Jurgen Freund / Aerial view of the Great Barrier Reef, Queensland, Australia

Jurgen Freund / Quicksilver Pontoon with tourists snorkeling watching fish split-level, Great Barrier Reef, Queensland, Australia 2006

Jurgen Freund / Aerial view of the Great Barrier Reef. Agincourt Reefs, off Port Douglas, Queensland

Mark Brownlow / Aerial view of Great Barrier Reef, Queensland, Australia September 2006, BBC Planet Earth

Doug Perrine / Pink anemonefish {Amphiprion perideraion} on host sea anemone {Heteractis magnifica} Great Barrier Reef, Queensland, Australia

Georgette Douwma / Tiger shark patrolling shallow water for egg laying turtles. Australia {Galeocerdo

Doug Perrine / Lined sweetlips {Plectorhynchus lineatus} Ribbon Reefs, Great Barrier Reef, Australia (Non-ex).

Jurgen Freund / Shovelnose ray {Rhinobatos batillum} Great Barrier Reef, Queensland, Australia

Jurgen Freund / Potato grouper / cod {Epinephelus tukula} Great Barrier Reef, Queensland, Australia

Jurgen Freund / Dwarf Minke whale diving {Balaenoptera acutorostrata} Great Barrier Reef, Queensland, Australia

Jurgen Freund / Minke whale {Balaenoptera acutorostrata} Great Barrier Reef, Queensland, Australia

Jurgen Freund / Grey reef shark {Carcharhinus amblyrhynchos} with Remora fish, Great Barrier reef, Queensland, Australia

Jurgen Freund / Aerial view of Great Barrier Reef, Queensland, Australia

Jurgen Freund / Anchovies {Engraulis encrasicolus} Great Barrier Reef, Australia.

Brandon Cole / Rear view of Dwarf minke whale from above {Balaenoptera acutorostrata subspecies} Great Barrier Reef, Australia. NOT FOR SALE IN USA

Brandon Cole / Surfacing Dwarf minke whale {Balaenoptera acutorostrata subspecies} Great Barrier Reef, Australia. NOT FOR SALE IN USA

Brandon Cole / Head profile of Dwarf minke whale {Balaenoptera acutorostrata} Great Barrier Reef, Australia. NOT FOR SALE IN USA

Brandon Cole / Dwarf minke whale {Balaenoptera acutorostrata subspecies} Great Barrier Reef, Australia NOT FOR SALE IN USA

Michael Pitts / Brain coral on coral reef Great Barrier Reef, Australia.

Georgette Douwma / Jewel tip coral {Porites attenuata} Great Barrier Reef, Australia