Peter Cairns / Wood patterns in Lodgepole pine (Pinus contorta) Yellowstone National Park, Wyoming, USA, January.

Jouan Rius / Black oak (Quercus velutina) in autumn, in Yosemite valley, Yosemite National Park, California, USA, December 2012.

Floris van Breugel / Hillside and swirling mists illuminated by the afternoon sun, in North Cascades Mountains, Washington, USA, September 2012.

Floris van Breugel / Japanese maple (Acer palmatum) leaves floating in a small pond in late autumn in Seattle's Washington Park Arboretum. Washington USA

Theo Bosboom / La Hoegne mountain stream in autumn, under water, near Hockai, Belgian Ardennes, November

Theo Bosboom / Beech (Fagus sp) leaves in autumn, Angerenstein park, Arnhem, the Netherlands, November 2011

Paul Harcourt Davies / Newly emerged adult Two-tailed Pasha (Charaxes jasius) Podere Montecucco. Orvieto, Umbria, Italy August

Paul Harcourt Davies / Newly emerged adult Two-tailed Pasha butterfly (Charaxes jasius) Podere Montecucco. Orvieto, Umbria, Italy August

Paul Harcourt Davies,Paul Harcourt Davies / Emergence of Two-tailed Pasha butterfly (Charaxes jasius) Podere Montecucco. Orvieto, Umbria, Italy August. Sequence 6 of 9

Paul Harcourt Davies / Emergence of Two-tailed Pasha butterfly (Charaxes jasius) Podere Montecucco. Orvieto, Umbria, Italy August. Sequence 1 of 9

Sven Zacek,Sven Zacek / Baltic sea is freezing up along the northern coast of Estonia. Lahemaa National Park, Estonia, January 2012.

Sven Zacek,Sven Zacek / Ice sheets before sunrise in Estonia. December 2009.