Jack Dykinga / Fallen Quaking aspen (Populus tremuloides) leaves on wood, autumn, Dixie National Forest, Utah, USA, October.
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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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Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull with aspens, western Alberta, Canada
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Marie Read / Western tanager (Piranga ludoviciana), male perched on aspen branch in spring, Mono Lake Basin, California, USA, May.
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Paul Williams / Trails in aspen leaf made by leaf miner, New Hampshire, USA, July.
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Paul Williams / Gray furcula moth (Furcula cinerea) camouflaged on Aspen leaf, New England, USA, July.
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Jeff Foott / View up into canopy of Aspen (Populus) trees against blue sky in autumn, Grand Staircase-Escalante National Monument, Utah, USA. October.
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Jeff Foott / Beaver (Castor canadensis) feeding on Aspen, Grand Teton National Park, Wyoming, USA, August.
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Jeff Foott / Beaver (Castor canadensis) feeding on Aspen, Grand Teton National Park, Wyoming, USA, August.
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Jeff Foott / Photographer watching Beaver (Castor canadensis) crossing the road carrying Aspen branch. Grand Teton National Park, Wyoming, USA. August 2012.
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Phil Savoie / Blue winged olive mayfly (Baetis tricaudatus) flying in front of aspen leaves. Bozeman, Montana, USA. April.
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Jack Dykinga / Aspens (Populus tremuloides) in soft morning light. Utah, USA, October.
