Sven Zacek / Ural owl (Strix uralensis) perching on an Apsen tree during the blue hour of dawn, Tartumaa, Estonia, April.
01410220
Jack Dykinga / Bark patterns of Aspen tree (Populus tremula) in front of a Ponderosa pine (Pinus ponderosa) trunk, Kaibab National Forest, Arizona, USA
01396446
Jack Dykinga / Charred remains of Aspen-fir forest near Hannagan's Meadow, at sunset with fireweeds growing in profusion amidst felled trees, Apache-Sitgreaves National Forest, Arizona, USA September 2011
01300678
Floris van Breugel / Autumn colours of Aspen tree (Populus tremula) Sierra Nevada, California, USA. September 2009
01292161
David Noton / Autumn colours of the Aspen trees (Populus tremula) in the snow, near Muleshoe, Bow Valley Parkway, Banff National Park, Alberta, Canada. October 2009
01292160
David Noton / Autumn colours of the Aspen trees (Populus tremula) in the snow, near Muleshoe, Bow Valley Parkway, Banff National Park, Alberta, Canada. October 2009
01261093
Laurie Campbell / Looking up the trunk of an Aspen tree (Populus tremula) in autumn, Speyside, Scotland, UK, October
01255514
Jack Dykinga / Willow, Cottonwood and Aspen trees on the banks of the Oxbow Bend, Snake River, at dawn, Teton mountain range in the background, Grand Teton National Park, Wyoming, USA
01247010
Wild Wonders of Europe / Zacek / Aspen tree (Populus tremula) trunk with a line of snow on it, Oulu, Finland, February 2009
01211370
Shattil & Rozinski / Fallen Aspen leaves {Populus tremula} on rocks in river in autumn, USA
01211371
Shattil & Rozinski / Aspen tree {Populus tremula} leaves and trunks in autumn, USA
01211367
Shattil & Rozinski / Swirling leaves of Aspen tree {Populus tremula} floating on water surface in autumn, USA
