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...

Dong Lei / Landscape with buddhist shrine, Tibet, Qinghai-Tibetan Plateau, China, August 2006.

Robin Chittenden / Highland cow (Bos taurus) feeding in long grass, Strumpshaw Fen RSPB, Norfolk, UK, May.

Jabruson / African Crake (Crecopsis egregia) portrait in long grass ,Mboko savannah-forest mozaic, Odzala-Kokoua National Park, Democratic Republic of Congo.

Ann & Steve Toon / Harvest mouse (Micromys minutus), captive, UK, June. *Not available for greetings cards, worldwide until November 2016*

John Cancalosi / Cross-Section of Utah Septarian Nodule, Utah. A type of geode, Utah Septarian Nodules are found about 15 miles east of Zion National park. They were formed in an ancient sea floor during the Cretaceou...

Staffan Widstrand,Staffan Widstrand / Fishermen in boats, Pulicat Lake, Tamil Nadu, India, January 2013.

Alex Mustard,Alex Mustard / A diver and a hydrothermal chimney. Note that he is obscured by the different temperature waters (from the chimney and the surrounding water) which are unable to mix. The sea water was 4 degrees Celsi...

David Pattyn / Dalmatian Pelican (Pelecanus crispus) group of pelicans with dark storm clouds approaching, Lake Kerkini, Greece, February

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

Alex Mustard / Pair of divers swimming in the blue lagoon at Silfraa, with fractured rocks in the foreground. Thingvellir National Park, Iceland. May 2011. 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...