Gavin Hellier / Anakena beach, monolithic giant stone Moai statues of Ahu Nau Nau, four of which have topknots, Isla de Pascua / Easter Island, Rapa Nui, Chile 2008

Alex Mustard / Planktonic sea walnut ctenophore (Mnemiopsis mccradyi) in open water, Seven Mile Beach, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / A split level view of shallow water and clouds in summer, Seven Mile Beach, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Andy Rouse / Landscape of Seven Islands and arctic coastline. Svalbard, Norway, May 2010.

Andy Rouse / Polar bear footprints on beach, Seven Islands, Svalbard, Norway

Gerry Ellis / Conch shell on Seven Mile Beach, Grand Turk Island, Turk and Caicos Islands, Caribbean

Sue Daly / Seven-armed Starfish (Luidia ciliaris). Les Dents, Sark, British Channel Islands, August.

Tui De Roy / Blue-footed boobies (Sula nebouxii) diving into water to catch marine prey. Espanola, Galapagos Islands, June.

Orsolya Haarberg / View of the Norweigan strandflat and peak of Tvillingene mountain from Kvasstinden (one of the Seven Sisters / De Syv Sostre) Alstahaug, Helgeland, Nordland, August 2007

Orsolya Haarberg / Man sitting on rock overlooking Rodoy (Tro) from Kvasstinden (top of one of the Seven Sisters / De Syv Sostre) Alstahaug, Helgeland, Nordland, August 2007, model released

Alex Mustard / Frigate bird (Fregata minor) soaring in formation around the moon at sunset, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Alex Mustard / Green / common iguana (Iguana iguana) climbing a tree, Seven Mile Beach, Grand Cayman, Cayman Islands, British West Indies.

Alex Mustard / Queen angelfish (Holacanthus ciliaris) portrait, swimming along the edge of a coral reef at dusk, Seven Mile Beach, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Lettuce leaf sea slug / nudibranch (Elysia crispata) crawls over the reef, Seven Mile Beach, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Arrow blenny (Lucayablennius zingaro) hovering above a coral reef, with its tail cocked ready to send its streamlined body shooting forward to catch its prey, Seven Mile Beach, Grand Cayman, Cayman Is...

Steve Gettle / Galapagos Sea Lion (Zalophus wollebaeki) group on rocks, Galapagos Islands, Ecuador

Tui De Roy / Blue-footed Booby (Sula nebouxii) trio taking flight, Galapagos Islands, Ecuador

Norbert Wu / Sperm Whale (Physeter macrocephalus) group of seven with diver filming them, Caribbean Sea, Dominica

Sue Daly / Seven Armed Starfish (Luidia ciliaris). Channel Islands, UK, July.

Sue Daly / Purple Topshell / Flat Top Shells (Gibbula umbilicalis). Channel Islands, UK, April.

Ingo Arndt / King Penguin (Aptenodytes patagonicus) group on beach walking into surf, Volunteer Point, Falkland Islands

Troels Jacobsen/Arcticphoto / Polar Bear (Ursus maritimus) mother with yearling cub, with their reflections in a melt pool. 82 degrees north, north of Seven Islands, Polar Basin, Svalbard, 2006.

Troels Jacobsen/Arcticphoto / Polar Bear (Ursus maritimus) on sea ice with her reflection in a melt pool. 82 degrees north, north of Seven Islands, Polar Basin, Svalbard, 2006.

Troels Jacobsen/Arcticphoto / Houses in Edinburgh of the Seven Seas, the main settlement on Tristan da Cunha. South Atlantic Islands, March 2007.

Troels Jacobsen/Arcticphoto / Houses in Edinburgh of the Seven Seas, the main settlement on Tristan da Cunha. South Atlantic Islands, March 2007.

Troels Jacobsen/Arcticphoto / Houses in Edinburgh of the Seven Seas, the main settlement on Tristan da Cunha. South Atlantic Islands, March 2007.

Troels Jacobsen/Arcticphoto / Houses in Edinburgh of the Seven Seas, the main settlement on Tristan da Cunha. South Atlantic Islands, March 2007.

Troels Jacobsen/Arcticphoto / Houses in Edinburgh of the Seven Seas, the main settlement on Tristan da Cunha, surrounded by solidified lava, South Atlantic Islands, March 2007.

Troels Jacobsen/Arcticphoto / Houses in Edinburgh of the Seven Seas, the main settlement on Tristan da Cunha with solidified lava in the foreground. South Atlantic Islands, March 2007.

Troels Jacobsen/Arcticphoto / Houses and the cemetery in Edinburgh of the Seven Seas with solidified lava in the foreground. Tristan da Cunha, South Atlantic Islands, March 2007.

Brent Stephenson / The seven Moai at Ahu Akivi that stand with their backs to the sea. Easter Island, October 2009.

Wild Wonders of Europe / Relanzó / Seven Shortfin pilot whales (Globicephala macrorhynchus) including one baby, Canary Islands, Spain, Europe, May 2009. WWE INDOOR EXHIBITION

Oriol Alamany / Least auklets (Aethia pusilla) in flight, Saint Paul Island, Pribilof Islands, Alaska, USA

Andy Rouse / View of Martensoya, Seven Islands, Svalbard, Norway

Oriol Alamany / Least auklets (Aethia pusilla) in flight, Saint Paul Island, Pribilof Islands, Alaska, USA

Pete Oxford / Gentoo penguins (Pygoscelis papua) walking up the beach, Pebble Island, Falkland Islands

Oriol Alamany / Moai rock statues in Ahu Akivi, Easter Island / Pascua / Rapa Nui

Tui De Roy / Chatham Albatross (Thalassarche eremita) on a cliff edge, critically endangered, The Pyramid, Chatham Islands

Doug Perrine / Seven Mile Beach, Grand Cayman Is, Cayman Island, Caribbean

Doug Perrine / Seven Mile Beach, Grand Cayman Is, Cayman Island, Caribbean

Marguerite Smits Van Oyen / French army arriving by helicopter on Seven Brothers Is, Djibouti, East Africa

Marguerite Smits Van Oyen / Moray eel on coast of The Seven Brothers coral islands, Djibouti, East Africa

Marguerite Smits Van Oyen / Coastal landscape of The Seven Brothers coral islands, Djibouti, East Africa

Marguerite Smits Van Oyen / Sea ledges on The Seven Brothers coral islands, Djibouti, East Africa

Roberto Rinaldi / Cliffside town of Lipari, Aeolian Islands / Seven Sisters, Sicily, Italy.

Roberto Rinaldi / Lipari town with castle on island of the same name. Lipari is the main island of the seven Aeolian islands, Italy. In the background is Vulcano.

Roberto Rinaldi / Stromboli, one of the seven Aeolian islands north of Sicily, Italy.

Roberto Rinaldi / Acquacalda (hotwater) beach, Lipari, Aeolian Islands, Italy. In the background is Vulcano another of the seven islands.

Roberto Rinaldi / Sailing among the Aeolian Islands / Seven Sisters, Sicily, Italy

Roberto Rinaldi / Fish eyes peeking out of volcanic sand on the sea bed of the Aeolian Islands / Seven Sisters, Sicily, Italy

Norbert Wu / Sperm Whale (Physeter macrocephalus) group of seven, Caribbean Sea, Dominica

Ingo Arndt / King Penguin (Aptenodytes patagonicus) group walking on beach, Volunteer Point, Falkland Islands

Julian Hume / Illustration of extinct water birds. Clockwise from top right: spectacled cormorant (Phalacrocorax perspicillatus) - extinct 1852,Bering Island; Reunion ibis (Threskiornis solitarius) - extinct 1710,R...

Julian Hume / Illustration of extinct rails. Clockwise from top right: Mauritius red rail (Aphanapteryx bonasia) extinct 1700,Mauritius,Mascarenes; San Cristobel gallinule (Gallinula silvestris) - extinct 1929,San...

Roberto Rinaldi / Seven coloured earth / sand. The colours and undulations come from natural erosion of the volcanic rocks, Chamarel, Mauritius.

Roberto Rinaldi / Coastline of Vulcano, one of the seven Aeolian Islands, Italy.

Sue Daly / Blue rayed limpets on seaweed {Patina pellucida} Jersey, Channel Is