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...

David Pattyn / Magnificent Frigatebirds (Fregata magnificens) trying to steal fish from a fisherman coming on land with a fresh catch, Puerto Lopez , Santa Elena Peninsula, Manabi Province, Ecuador, July

David Pattyn / Magnificent Frigatebirds (Fregata magnificens) trying to steal fish from fishermen coming on land with a fresh catch, Puerto Lopez , Santa Elena Peninsula, Manabi Province, Ecuador, July

David Pattyn / Magnificent Frigatebirds (Fregata magnificens) trying to steal fish from fishermen coming on land with a fresh catch, Puerto Lopez , Santa Elena Peninsula, Manabi Province, Ecuador, July

Guy Edwardes / Trees with new foliage, view from Eggardon Hill, Bridport, Dorset, England, UK. May 2010.

Guy Edwardes / Trees and hedgerows with new foliage, view from Eggardon Hill, Bridport, Dorset, England, UK. May 2013.

Lynn M Stone / Yellow Labrador retriever in fresh snow, Clinton, Connecticut, USA

Sven Zacek / Otter (Lutra lutra) walking in fresh ice, Southern Estonia, January.

Juergen Freund / Giant mottled fresh water eels (Anguilla marmorata) in shallows, split level view, Lissenung Island, Kavieng, New Guinea. Second Place in the Portfolio Award of the Terre Sauvage Nature Images Awards...

Sven Zacek / Frozen Birch trees (Betula sp) in a grove, Tartumaa, Estonia, January 2013.

Sven Zacek / Pink algae in fresh snow on the coast of the Baltic Sea, Lahemaa National Park, Northern Estonia. December 2012.

Ingo Arndt / European Beaver (Castor fiber) fresh bite marks and felled trees, Spessart, Germany