Michele Westmorland / Schooling fish around healthy reef system, Castle Rock, Komodo National Park, Indonesia.

Mark MacEwen / Green Sea Turtle (Chelonia mydas) returning to sea after Egg laying, Raine Island, Australia. Raine Island is the largest and most important green sea turtle nesting area in the world, with over 14,00...

Steven Kazlowski / Killer whale (Orcinus orca) large pod with one male approaching, in Kenai Fjords National Park, Chiswell Islands National Marine Sanctuary, South Central Alaska, USA

Steven Kazlowski / Killer WHale / Orca (Orcinus orca) bull and cow in Resurrection Bay, Kenai Fjords National Park, outside Seward, Alaska, May.

Roland Seitre / Platypus (Ornithorhynchus anatinus) underwater. Captive. Australian Reptile Park, Gosford, New South Wales.

Claudio Contreras / French Angelfish (Pomacanthus paru) with a Smallmouth Grunt (Haemulon chrysargyreum) and Blade Fire Coral (Millepora complanata). Cancun National Park, Caribbean Sea, Mexico.

Claudio Contreras / Smooth Trunkfish (Lactophrys triqueter). Cancun National Park, Caribbean Sea, Mexico.

Claudio Contreras / Porkfish (Anisotremus virginicus) school. Cancun National Park, Caribbean Sea, Mexico.

Claudio Contreras / Atlantic Sailfish (Istiophorus albicans) attacking school of sardine (Sardinella aurita) bait ball. Isla Mujeres, Caribbean Sea, Mexico.

Claudio Contreras / Green Seaturtle (Chelonia mydas) in profile above sandy shallow sea bed. Endangered, Cancun National Park, Caribbean Sea, Mexico.

Claudio Contreras / Queen Angelfish (Holacanthus ciliaris) among other coral fish. Cancun National Park, Caribbean Sea, Mexico.

Claudio Contreras / Saucereye porgy (Calamus calamus). Cancun National Park, Caribbean Sea, Mexico.

Graham Eaton / An underwater view of a woodland stream, River Glaslyn, Snowdonia NP, Gwynedd, Wales, UK, May

Graham Eaton / A low angle view of a waterfall, from within a mountain stream, Ogwen Cottage, Snowdonia NP, Gwynedd, Wales, UK, February

Graham Eaton / Underwater landscape within a mountain stream, showing water turbulence, Snowdonia NP, Gwynedd, Wales, UK, December

Graham Eaton / View looking up a waterfall from within a stream, Snowdonia NP, Gwynedd Wales, UK, December

Graham Eaton / A split-level image of a mountain stream, in autumn, with water droplets on lens, Nant Ffrancon Valley, Snowdonia NP, Gwynedd, Wales, UK, October

Graham Eaton / Underwater view of a rapidly flowing mountain stream, Snowdonia NP, Gwynedd, Wales, UK, November

Graham Eaton / A split-level view through a small waterfall, Llanberis, Snowdonia NP, Gwynedd, Wales, UK, July

Graham Eaton / Underwater view of a mountain lake, Llyn Idwal, Snowdonia NP, Gwynedd, Wales, UK, December

Graham Eaton / Underwater view of a mountain lake with frozen surface, Llyn Idwal, Snowdonia NP, Gwynedd, Wales, UK, December

Graham Eaton / Split level shot of Llyn Idwal and Cwm Idwal, showing freshwater habitat with Green lacustrine algae (Chlorophyceae sp.), Snowdonia NP, Gwynedd, Wales, UK, August

Graham Eaton / Underwater view of a mountain lake, Llyn Idwal, Gwynedd, Snowdonia NP, Wales, UK, December

Graham Eaton / Underwater view of River Glaslyn rapids, Snowdonia NP, Gwynedd, Wales, UK, April

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.

Inaki Relanzon / Australian Sea Lion (Neophoca cinerea) sitting on beach with one flipper up, Seal Bay Conservation Park, Kangaroo Island, South Australia State, Australia.

Luiz Claudio Marigo / Corcovado Hill and the Christ Redemptor statue in the Atlantic Rainforest of Tijuca National Park, Rio de Janeiro City, Rio de Janeiro State, Southeastern Brazil, August 2011

Luiz Claudio Marigo / Family of Southern coatis (Nasua nasua) in Atlantic Rainforest, Tijuca National Park, Rio de Janeiro City, Southeastern Brazil.

Pete Oxford / Shoal of Silky sharks (Carcharhinus falciformis) Jardines de la Reina National Park, Cuba

Pete Oxford / Silky shark (Carcharhinus falciformis) Jardines de la Reina National Park, Cuba, Caribbean

Pete Oxford / Horse eye trevally / jack (Caranx latus) Jardines de la Reina National Park Cuba, Caribbean

Pete Oxford / Black grouper (Mycteroperca bonaci) with mouth wide open, Jardines de la Reina National Park, Cuba, Caribbean

Pete Oxford / Upside down Jellyfish (Cassiopeia sp) Jardines de la Reina National Park, Cuba, Caribbean

Pete Oxford / Caribbean reef shark (Carcharhinus perezi) Jardines de la Reina National Park, Cuba

Graham Eaton / Under the ice scene of freshwater frozen lake. Llyn Dinas, Snowdonia, Wales, December 2010.

Georgette Douwma / Soft coral and other invertebrates growing on mangrove roots (Rhizophora sp.) on the edge of coral reef. Raja Ampat, Indonesia.

Georgette Douwma / Bigeye Scad (Selarcrumenophthalmus). Misool, Raja Ampat, West Papua, Indonesia.

Georgette Douwma / Bubble Tip Anemone (Entacmaea quadricolor). The tentacles are usually a dull brown, but this anemone is partially bleached and has lost most of the endosymbiotic zooxanthellae. Raja Ampat, West Papua,...

Georgette Douwma / Plastic bags floating at the surface of the sea. Bunaken National Park, North Sulawesi, Indonesia.

Anup Shah / Proboscis monkey (Nasalis larvatus) male walking across the mudflats of a mangrove swamp revealed at low tide with the sea in the background, Bako National Park, Sarawak, Borneo, Malaysia, March

Graham Eaton / Split level image of Cwm Idwal and Llyn Idwal showing lake and mountain habitat and lacustrine algae, Snowdonia NP, North Wales, UK, January 2010. Winner of the Living Landscape: Connectivity categor...

Georgette Douwma / Leather Coral (Sinularia flexibilis). Komodo National Park, Indonesia.

Georgette Douwma / Barrel Sponge (Xestospongia testudinaria) on coral reef with soft corals (Scleronephthya sp), gorgonian and Lyretail anthias (Pseudanthias squamipinnis). Komodo National Park, Indonesia.

Georgette Douwma / Black-blotched Porcupinefish / Short-spine Porcupinefish (Diodon liturosus) and a Klein's butterflyfish (Chaetodon kleinii) sheltering in barrel sponge. Komodo National Park, Indonesia.

Georgette Douwma / Soft Coral (Dendronephthya sp) with Blueline snappers (Lutjanus kasmira). Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Hawksbill Turtle (Eretmochelys imbricata) swimming down after taking a breath. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Painted Frogfish (Antennarius pictus), juvenile perched on bottle top. Rinca, Komodo National Park, Indonesia.

Pete Oxford / Two Common Bottlenose Dolphin (Tursiops truncatus) in shallow water. Punta Allen, Sian Ka'an Biosphere Reserve, Quintana Roo, Yucatan Peninsula, Mexico.

Juergen Freund / Flat calm seas of Tubbataha Reef, with a snorkeler swimming at the surface. Tubbataha National Marine Park, Philippines, April 2009.

Juergen Freund / Fisherman carrying a Spanish mackerel (Scomberomorus sp) caught off Komodo Island, Indonesia, August 2009.

Juergen Freund / Massive barrel sponge (Xestospongia testudinaria) and diver. Tubbataha Reef National Marine Park, Palawan, Philippines, April 2009. Model released.

Juergen Freund / Coral reef with hard corals and cabbage coral, Komodo NP, Indonesia

Juergen Freund / Split level of dive boat "Seven Seas", coral reef and island, Komodo NP, Indonesia, August 2009.

Juergen Freund / Split level of snorkeler over coral reef on white sandy seabed contrasting with dry topside landscape in background, Komodo NP, Indonesia, August 2009. Model released.

Eric Baccega / Polar Bear (Ursus maritimus) mother with her 3-month cub, soon after emerging from their hibernation den. Wapusk National Park, Manitoba, Canada, March.

Eric Baccega / Polar Bear (Ursus maritimus) mother resting while her 3-month cubs play. Wapusk National Park, Manitoba, Canada, March.

Juergen Freund / Detail of eye of Parrotfish (Scarus rivulatus) Komodo NP, Indonesia

Juergen Freund / Sea apple (Pseudocolochirus violaceus) with tentacles exposed, feeding, Komodo NP, Indonesia, Indo-pacific.

Juergen Freund / Clown anemonefish (Amphiprion percula) on bleached coral, Komodo NP, Indonesia, Indo-pacific.

Juergen Freund / Zebra / Adam's urchin crab with eggs (Zebrida adamsii) on Fire sea urchin (Mespilia globulus), Komodo NP, Indonesia, Indo-pacific.

Fabio Liverani / Freshwater Crab (Potamon fluviatile) in a shallow stream - split perspective showing crab beneath and fluvial habitat. Foreste Casentinesi National Park, Italy, July.

Georgette Douwma / Giant Frogfish (Antennarius commerson) on coral reef. The animal can vary greatly in colour and pattern. Bali, Indonesia, December.

Fabio Liverani / Freshwater Crab (Potamon fluviatile) in a shallow stream - split perspective showing crab beneath and fluvial habitat. Foreste Casentinesi National Park, Italy, July.

Fabio Liverani / Freshwater Crab (Potamon fluviatile) in a shallow stream - split perspective of underwater and habitat. Foreste Casentinesi National Park, Italy, July.

Chien Lee / Spectral Tarsier (Tarsius tarsier), Tangkoko Nature Reserve, Sulawesi, Indonesia

Georgette Douwma / White banded/ Scarlet cleaner shrimp (Lysmata amboinensis) on Coral hind (Cephalopholis miniata) Rinca, Komodo National Park, Indonesia, October

Georgette Douwma / Pink anemonefish (Amphiprion perideraion) with anemone showing the effects of bleaching. The bleached anemone is almost white, whereas the unbleached anemone is brown due to the presence of symbiotic...

Yva Momatiuk & John Eastcott / Sockeye Salmon (Oncorhynchus nerka) group swimming in fast current during spawning run, Adams River, Roderick Haig-Brown Provincial Park, British Columbia, Canada

Yva Momatiuk & John Eastcott / Sockeye Salmon (Oncorhynchus nerka) group swimming upstream between forested banks during spawning run, Adams River, Roderick Haig-Brown Provincial Park, British Columbia, Canada

Yva Momatiuk & John Eastcott / Sockeye Salmon (Oncorhynchus nerka) group swimming upstream between forested banks during spawning run, Adams River, Roderick Haig-Brown Provincial Park, British Columbia, Canada

Eric Baccega / Flowerpot sea stacks with outgoing tide at Hopewell Rocks. The world's highest tides. Bay of Fundy, New Brunswick, Canada, September 2010

Konrad Wothe / Australian Red Claw Crayfish (Cherax quadricarinatus), Daintree National Park, North Queensland, Queensland, Australia

Suzi Eszterhas / Harbour / Common Seal (Phoca vitulina) moving from an exposed rock into the water, Katmai National Park, Alaska, USA

Fabio Liverani / Crested Newt (Triturus cristatus carnifex) underwater view of female swimming near surface, Traversari lake, Campigna National Park, Emilia Romagna and Tuscany regions, Italy

Fabio Liverani / Crested Newt (Triturus cristatus carnifex) split level view of female swimming near surface, Traversari lake, Campigna National Park, Emilia Romagna and Tuscany regions, Italy

Fabio Liverani / Crested Newt (Triturus cristatus carnifex) underwater view of female swimming on surface, Traversari lake, Campigna National Park, Emilia Romagna and Tuscany regions, Italy

Solvin Zankl / An Olive ridley sea turtle hatchling (Lepidochelys olivacea) on its way to the sea. The hatchlings orientate themselves by the brightness of the horizon above the ocean, Ostional NP, Costa Rica. Octob...

Graham Eaton / Underneath the ice of Llyn Dinas lake, Snowdonia NP, Wales, December

Georgette Douwma / Large shoal of Horse mackerel (Megalaspis cordyla) schooling. Rinca, Komodo National Park, Indonesia.

Graham Eaton / An underwater view of a mountain stream showing internal reflections on the water surface, Snowdonia NP, Gwynedd, Wales, UK, December 2009.

Graham Eaton / Underwater view of River Glaslyn rapids, Beddgelert, Snowdonia NP, Wales, April 2010.

Georgette Douwma / Soft coral (Dendronephthya mucronata) on sandy seabed. Komodo National Park, Indonesia

Georgette Douwma / Loki whip goby (Bryaninopss loki) on Sea pen (Virgularia gustaviana). Komodo National Park, Indonesia

Georgette Douwma / Purple sea pen (Virgularia gustaviana) on sandy sea bed. Rinca, Indonesia

Georgette Douwma / Tree coral (Dendronephthya sp) on sandy sea bed. Rinca, Komodo National Park, Indonesia

Georgette Douwma / Sea pen (Virgularia gustaviana) with a small porcelain crab on sandy sea bed, purple form. Rinca, Indonesia.

Georgette Douwma / Bigscale soldierfish (Myripristis berndti), Sweetlips, Philippine chromis with Blueline snappers in background. Komodo National Park, Indonesia

Juergen 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

Juergen 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

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

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

Wild Wonders of Europe / Lundgre / Diver close to tectonic boundary between the Eurasian and the North American plates, Silfra, Thingvellir lake, Thingvellir National Park, Iceland, May 2009.

Wild Wonders of Europe / López / Aerial view of saltmarsh exposed at low tide, Baha de Cdiz Natural Park, Cdiz, Andalusia, Spain, March 2008