Pascal Kobeh / Giant clam (Tridacna) on 'Lotus' artificial reef, built in 2001 with a steel frame using mild electric currents to encourage coral growth, with diver in the background. Vabbinfaru Island in North Male...

Doug Perrine / Rough-toothed dolphins (Steno bredanensis) Keauhou, Kona, Hawaii, USA, Central Pacific Ocean.

Franco Banfi / Scuba diver and Manta ray (Manta birostris), San Benedicto, Revillagigedo (Socorro) Islands, Mexico, East Pacific Ocean. Model released.

Michael Pitts / Diver on the wreck of the US Submarine tender USS Macaw, sunk in the World War II due to a navigation error, Midway atoll, Pacific Ocean. Model released.

Alex Mustard / Circular fisheye photograph of a colourful coral reef with silhouetted diver, East End, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea. Model released

Alex Mustard / A diver exploring a coral reef with formation of brown tube sponges (Agelas conifera) red rope sponges (Amphimedon compressa) and deepwater sea fans (Iciligorgia nodulifera) East End, Grand Cayman, Ca...

Alex Mustard / Diver swimming through dense school of Silversides (Atherinidae) inside a coral cavern, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea. Model released

Jeff Rotman / Looking down on the shipwreck of the small freighter 'Ora Verde' that sank in 1980, Grand Cayman Island, Caribbean Sea Model released.

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) squirting ink in defense as it jets away, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) female guarding her eggs, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) flaring out its arms as it settles to the ocean bottom after swimming, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) flaring out its arms as it prepares to drop to the ocean bottom after swimming, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) using its suction discs to hold two crabs it has caught, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) scurrying across the ocean floor as it forages for crabs, Quadra Island, British Columbia, Canada

Fred Bavendam / Green Sea Urchin (Strongylocentrotus droebachiensis) group and one Red Sea Urchin (Strongylocentrotus franciscanus), Quadra Island, British Columbia, Canada

Fred Bavendam / Sunflower Sea Star (Pycnopodia helianthoides) crawling amidst Kelp, Sponge, Sea Anemones, Sea Urchins, and a Sculpin, Quadra Island, British Columbia, Canada

Alex Mustard / Diver swimming through Tolberone Tunnel, a triangular tunnel through the middle of an island in Raja Ampat. Giant barrel sponges (Xestospongia muta) growing on the floor of the tunnel, which have an u...

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) eight kilograms with four foot arm span, squeezing out though a hole 50 millimeters x 100 millimeters, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) eight kilograms with four foot arm span, squeezing, out through a hole 50 millimeters x 100 millimeters, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) eight kilograms with four foot arm span, squeezing out though a hole 50 millimeters x 100 millimeters, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) eight kilograms with four foot arm span, squeezing out though a hole 50 millimeters x 100 millimeters, Quadra Island, British Columbia, Canada

Colin Monteath / Scientists and field assistants view Mt Discovery from the summit of Mt Erebus, Ross Island, Antarctica

Fred Bavendam / Wolf Eel (Anarrhichthys ocellatus) close up, head shot, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) and diver, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) swimming with diver, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) swimming with diver, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) couple mating, a smaller red male on top of a much larger grey female, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) couple mating, smaller red male on top of a much larger grey female, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) foraging on ocean bottom in a sea grass bed, Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Giant Octopus (Enteroctopus dofleini) scurrying across the ocean floor as it forages for crabs, Quadra Island, British Columbia, Canada

Fred Bavendam / Ascidian (Corella willmeriana), Quadra Island, British Columbia, Canada

Fred Bavendam / Pacific Herring (Clupea pallasi) school, Quadra Island, Canada

Fred Bavendam / Cloud Sponge (Aphrocallistes vastus), Quadra Island, British Columbia, Canada

David Fleetham / Slate pencil sea urchin (Heterocentrotus mammillatus), being held by couple snorkeling, Hawaii.

Paul D Stewart / Falklands Wolf (Dusicyon australis). 1778 'The Wolf Fox of Faulklands Islands', a copperplate engraving from Commodore Byron's 'An account of a Voyage Round the World'. The Falkland Islands Wolf, Dusi...

Paul D Stewart / Illustration of Steller's Sea Cow (Hydrodamalis gigas) from 'Naturhistoriche Abbinldungen der Saeugethiere' by Heinrich Rudolph Schinz. later edition circa 1841. Fine contemporary coloured lithograph...

Roland Seitre / Hawaii amakihi (Chlorodrepanis virens) feeding on flower nectar, Palili Forest discovery trail, Big Island, Hawaii.

Roland Seitre / Hawaii amakihi (Chlorodrepanis virens) feeding on flower nectar, Palili Forest discovery trail, Big Island, Hawaii.

Roland Seitre / Hawaii amakihi (Chlorodrepanis virens) perched in flowering bush, Palili Forest discovery trail, Big Island, Hawaii.

Roland Seitre / Hawaii amakihi (Chlorodrepanis virens) perched in flowering bush, Palili Forest discovery trail, Big Island, Hawaii.

Roland Seitre / Mamane (Sophora chrysophylla) in flower, Palila forest discovery trail, Big Island, Hawaii.

Roland Seitre / Beggarticks (Bidens menziesii) in flower, Palili forest discovery trail ,Big Island, Hawaii.

Roland Seitre / Mamane (Sophora chrysophylla) in flower, Palila forest discovery trail, Big Island, Hawaii.