Alex Mustard / A diver explores Silfra Canyon, a deep fault filled with fresh water in the rift valley between the Eurasian and American tectonic plates at Thingvellir National Park, Iceland. May 2011. In this phot...

Steve Downer / Slug (Species unknown) descending on slime rope from leaf. UK. June.

Juergen Freund / Schooling silversides (Atheriniformes) split level with karst limestone cliff and West Papuan fishermen in their dugout outrigger canoe. Raja Ampat, Indonesia. Second Place in the Portfolio Award of t...

Alex Mustard / Red eye medusa (Polyorchis penicillatus) with hitchhiking amphipods (Hyperia medusarum). Browning Pass, Vancouver Island, British Columbia, Canada. North East Pacific Ocean.

Jack Dykinga / Saguaro cactus (Carnegiea gigantea) in flower at night, with The Milky Way behind, Sonoran Desert National Monument, Sierra Estrella Mountain Wilderness, Arizona, USA, May.

Juergen Freund / Giant clam (Tridacna gigas) Raja Ampat, West Papua, Indonesia.

Floris van Breugel / Aurora borealis / Northern Lights seen from entrance to tent, Brooks Range, Gates of the Arctic National Park, Alaska, USA, September 2014.

Jordi Chias / Juvenile Green turtle (Chelonia mydas) Armenime cove, South Tenerife, Canary Island, Atlantic Ocean

Pal Hermansen / Aerial view of river delta, South West Iceland, June 2014.

Stephen Dalton / Out of focus close-up of a rose (Rosa sp), UK.

Pascal Kobeh / Group of Short-finned pilot whales (Globicephala macrorhynchus) swimming down into deep water, Costa Rica. Pacific ocean.

Pascal Kobeh / Female Humpback whale (Megaptera novaeangliae) with its calf in open water, Reunion Island. Indian Ocean.

Olga Kamenskaya / Diver with Baikal sponges (Lubomirskia baicalensis). Lake Baikal, Russia, March 2007. Model released.

Michael Pitts / Diver Ron Howse ascending the shot line in Lyme Bay, off Portland Bill, Dorset, England, UK, September 2010. Model released.

Michael Pitts / Green Turtle (Chelonia mydas) hatchling swimming out to deep water from Karan Island, Saudi Arabia, Arabian Gulf.

Jabruson / Hammer Headed bats (Hypsignathus monstrosus) in gloved hand - live mist net catch for blood sampling in search of the unknown reservoir host for Ebola virus. Ebola outbreaks in Mbomo in 2003 killed 12...

Steven Kazlowski / Northern lights (Aurora borealis) glowing brightly over trees along Steese Highway, Cleary Point, outside Fairbanks, Alaska

Jussi Murtosaari / Northern Lights over forest, central Finland, March 2013

Christophe Courteau / Tourists and guide using snowshoes on an ecotourism trekking holiday, Svalbard, Norway, June, 2012. Model released.

Alex Mustard / A long exposure renders Bar jacks (Carangoides ruber) as ghostly trails as they swim around a sponge, on a coral reef, at night. East End, Grand Cayman, Cayman Islands. Overall winner of GDT competiti...

Kirkendall-Spring / Starry night sky over Smith Rocks State Park, Oregon, May 2013.

Kirkendall-Spring / Hills in the Lamar Valley, in snow, Yellowstone National Park, Wyoming, USA, February 2013.

Jouan Rius / Gypsum sand dune at sunset, White Sands National Park, Chihuahuan Desert, New Mexico, USA, December 2012.

Charlie Summers / The Great Andromeda Galaxy (M32) and its two brightest satellite galaxies M110 to the right and close to Andromeda, and M32 (Messier 32) to the upper left. June 11, 2013 at 02.27. Taken with digital i...

Alex Mustard / A diver explores Chac Mool Cenote (or sinkhole) Puerto Aventuras, Quintana Roo, Mexico. No release available.

Alex Mustard,Alex Mustard / Pair of divers floating in Silfra Canyon, a deep fault filled with fresh water in the rift valley between the Eurasian and American tectonic plates) at Thingvellir National Park, Iceland. May 2011. I...

Alex Mustard / The narrow Nes Canyon, a fault filled with fresh water in the rift valley between the Eurasian and American tectonic plates in northern Iceland. May 2011.

Alex Mustard,Alex Mustard / A view down Nikulasargj Canyon, deep fault filled with fresh water in the rift valley between the Eurasian and American tectonic plates at Thingvellir National Park, Iceland. May 2011. In this photo t...

Alex Mustard / Diver explores the cathedral at Silfra Canyon, deep fault filled with fresh water in the rift valley between the Eurasian and American tectonic plates, at Thingvellir National Park, Iceland. May 2011....

Alex Mustard / A diver explores Nikulasargj Canyona deep fault filled with fresh water in the rift valley between the Eurasian and American tectonic plates at Thingvellir National Park, Iceland. May 2011. In this ph...

Jan Hamrsky,Jan Hamrsky / Trumpet animalcules (Stentor polymorphus) with algal symbionts (Chlorella), Europe, controlled conditions

Franco Banfi / Scuba diver under and between ice formations, Lake Sassolo, Sambuco valley, Ticino, Switzerland. Model released.

Graham Eaton / A foggy scene on the road to the Tan Hill Inn, Richmond, Yorkshire, June 2012

Michael Pitts / Mike de Gruy, underwater camerman, in Remora submersible, Mediterranean

Erlend Haarberg,Erlend Haarberg / Aerial view of river meandering in grey sand in the Landeyjarsandur, Iceland, September 2010.

Georgette Douwma / Dead surgeonfish being 'cleaned' by a Bleusreak cleaner wrasse (Labroides dimidiatus). Many fish observed dead or dying on reefs in the Maldives, April 2012. Another episode of dying fish was in 2007....

Nick Garbutt / Unravelling Fern fronds (Unknown species). Near Nepenthes Field Camp, mid-altitude montane forest. Centre of Maliau Basin, Sabah's 'Lost World', Borneo.

Juergen Freund / Split level image of Papuan fisherman standing on his dugout canoe over shallow corals, New Ireland, Papua New Guinea, June 2010

John Cancalosi / Fossil Fly (species unknown) from the Early Cretaceous Period. Santana Formation, Brazil

Charlie Summers / Gentoo Penguin (Pygoscelis papua) diving off iceberg and into waters of Pleneau Bay, Antarctica, November

Onne van der Wal / Green turtle (Chelonia mydas) swimming over sea grass, Grenadines, Caribbean, February 2010.

Wild Wonders of Europe / Benvie / Caterpillar (unknown species) Fliess, Naturpark Kaunergrat, Tirol, Austria, July 2008 WWE OUTDOOR EXHIBITION

Nick Garbutt / Giant Stag Beetle {Lucanidae} (unknown species) Montane rainforest, Mt Kinabalu, Sabah, Borneo.

Nick Garbutt / Bizarre flat jelly-like caterpillar (species unknown) on underside of leaf, Lowland rainforest, Danum Valley, Sabah, Borneo.

Phil Savoie / Tortoise head close up species unknown Sequence 2/2

Phil Savoie / Tortoise in defensive posture - head drawn back into shell, species unknown. Sequence 1/2

Pete Oxford / Feather mimic caterpillar found in Macipucuna Cloudforest Andes, Ecuador, South America. Unidentified species

Shane Gross / Pelagic squid (species unknown) uses ink (yellow patch) to hide from potential prey. Inking is a common hunting practice in the open ocean. Anilao, Philippines.

Shane Gross / Unknown species of pelagic swimming crab, covered in barnacles swimming in the open ocean at night. She is tending to her eggs in a pouch. Anilao, Philippines.

Shane Gross / Species unknown, possibly a pelagic juvenile threadfin (Polynemidae) at night, in the open ocean off Anilao, Philippines.

Shane Gross / Larval octopus (species unknown) drifting in the open ocean off Anilao, Philippines.

Shane Gross / Tiny larval octopus (species unknown) shot in open water at night off Anilao, Philippines

Shane Gross / Pelagic squid (species unknown) cannibalizes another squid in the open ocean at night off Anilao, Philippines.

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Stephane Granzotto / Scuba diver exploring the Yonaguni Monument, a submerged rock formation off the coast of Japan. It is unknown if these sandstone rocks are formed naturally or are of human construction, Yoguni, Japan....

Magnus Lundgren / Wild Wonders of China / Carp-like fish, unknown species, swimming in a river at Tangjiahe National Nature Reserve, Sichuan Province, China

Magnus Lundgren / Wild Wonders of China / Carp-like fish, unknown species, swimming in a river at Tangjiahe National Nature Reserve, Sichuan Province, China

Ralph Pace / Humpback Whale (Megaptera novaeangliae) surfacing, showing bumps of unknown cause, Maui, Hawaii, image taken under NMFS Permit # 19225

Steve Downer / Slug (Species unknown) descending on slime rope from leaf. UK. June.

Steve Downer / Slug (Species unknown) descending on slime rope from leaf. UK. June.

Steve Downer / Close shot of newly hatched slug (unknown species) moving over developing eggs. UK.

Steve Downer / Slug embryos, species unknown, moving in egg cases. UK

Steve Downer / Newly hatched slug, species unknown, moving over developing eggs. UK.

Steve Downer / Newly hatched slug, species unknown, moving over developing eggs. UK.

Steve Downer / Close up shot of terrestrial mite, species unknown, on needle. UK.

Steve Downer / Close up shot of terrestrial mite, species unknown, on needle. UK.

Steve Downer / Close-up slug embryo, species unknown, moving in egg case. UK.

Steve Downer / Group of slug embryos, species unknown, moving in egg cases. UK.

Steve Downer / Group of slug embryos, species unknown, moving in egg cases. UK.

Steve Downer / Close-up slug embryo, species unknown, moving in egg case. Birmingham UK

Steve Downer / Slug embryo, species unknown, moving in egg case. UK.

Ingo Arndt / Moving sea ice, Magdalen Islands, Gulf of St Lawrence, Quebec, Canada, March 2013.

Nick Garbutt / Leaf mimic bush cricket or 'katydid' (unknown species, family Tettigoniidae) in the middle of moulting its skin. Moulting from one sub-adult stage (instar) to another is known as ecdysis. Mont...

Nick Garbutt / Sequence of forest ants (unknown species) dismembering a dead tarantula (unknown species). Danum Valley, Sabah, Borneo.

Nick Garbutt / Sequence of forest ants (unknown species) dismembering a dead tarantula (unknown species). Danum Valley, Sabah, Borneo.

Nick Garbutt / Sequence of forest ants (unknown species) dismembering a dead tarantula (unknown species). Danum Valley, Sabah, Borneo.

Nick Garbutt / Sequence of forest ants (unknown species) dismembering a dead tarantula (unknown species). Danum Valley, Sabah, Borneo.

Nick Garbutt / Sequence of forest ants (unknown species) dismembering a dead tarantula (unknown species). Danum Valley, Sabah, Borneo. Staged sequence using a spider that was already dead. No animal was harmed for t...

Chris Mattison / Camouflaged grasshopper, unknown species, Springbok, South Africa October

Cyril Ruoso / Phasme / Walking stick insect, unknown species, 1000m altitude, Tarapoto, Amazon, Peru

Cyril Ruoso / Phasme / Walking stick insect, unknown species, 1000m altitude, Tarapoto, Amazon, Peru

Merryn Thomas / Man in vehicle, photographing Salar de Uyuni salt flats, Atacama Desert, Bolivia. February 2014.

Paul D Stewart / Illustration of Apollo butterflies (Parnassius apollo) and the False Apollo (Parnassius mnemosyne) as well as chrysalis and Sedum foodplant, By unknown European artist, 1875.

Paul D Stewart / Series of paintings of Apollo butterflies (Parnassius apollo) showing variation between subspecies. By unknown European artist, from 1875.

Cyril Ruoso / Cactus, unknown species, blooming by night in San Fernando reserve, Nazca Desert, Peru.

Cyril Ruoso / Scorpion, unknown species amongst feathers, a specialist feeder on soft ticks, guano island of Pescadores, Peru