Jack Dykinga / Fallen Quaking aspen (Populus tremuloides) leaves on wood, autumn, Dixie National Forest, Utah, USA, October.
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Tim Fitzharris / Coniferous forest in winter, Aspen Vista, Santa Fe National Forest, New Mexico
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Yva Momatiuk & John Eastcott / Quaking Aspen (Populus tremuloides) trees in autumn, Rocky Mountains, Colorado
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Yva Momatiuk & John Eastcott / Quaking Aspen (Populus tremuloides) trees in autumn, Rocky Mountains, Colorado
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Yva Momatiuk & John Eastcott / Quaking Aspen (Populus tremuloides) trees in autumn, Utah
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Yva Momatiuk & John Eastcott / Quaking Aspen (Populus tremuloides) trees in autumn, Utah
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Sven Zacek / Ural owl (Strix uralensis) perching on an Apsen tree during the blue hour of dawn, Tartumaa, Estonia, April.
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Sven Zacek / Ural owl (Strix uralensis) chick trying to climb an aspen tree with its beak, talons and wings, Southern Estonia. June.
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Sven Zacek / Ural owl (Strix uralensis) chick trying to climb an aspen tree with its beak, talons and wings, Southern Estonia. June.
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Jack Dykinga / Road winding through aspen trees (Populus tremuloides) in autumn, Dixie National Forest, Boulder Mountain, Utah. October 2013.
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Jack Dykinga / Bark patterns of Aspen tree (Populus tremula) in front of a Ponderosa pine (Pinus ponderosa) trunk, Kaibab National Forest, Arizona, USA
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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
