Donald M. Jones / American Elk (Cervus elaphus nelsoni) bull with aspens, western Alberta, Canada
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SCOTLAND: The Big Picture / Young Aspen trees (Populus tremula) in a polytunnel at Trees For Life's nursery on Dundreggan Estate, Scotland, UK, June.
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Sven Zacek / Ural owl (Strix uralensis) female on nest in old Aspen (Populus tremula) tree. Tartumaa, Southern Estonia. April.
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SCOTLAND: The Big Picture / Aspen (Populus tremula) saplings to be used in Caledonian Pine Forest habitat restoration. Trees for Life nursery, Dundreggan Conservation Estate, Dumfries and Galloway, Scotland, UK.
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Nick Upton / Aspen (Populus tremula) with Aspen trunk rot / False tinder conk mushroom (Phellinus tremulae). Trees with rotten cores provide ideal nest holes for the Siberian flying squirrel (Pteromys volans). Mur...
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Nick Upton / Mixed wet woodland including Aspen (Populus tremula) and Downy birch (Betula pubescens). Inhabited by rare surviving Siberian flying squirrel (Pteromys volans) population. Near Lisaku, Estonia. April...
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Nick Upton / Mixed wet woodland including Aspen (Populus tremula) and Downy birch (Betula pubescens). Inhabited by rare surviving Siberian flying squirrel (Pteromys volans) population. Near Lisaku, Estonia. April...
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Nick Upton / Lisaku Park Forest from above, a mix of mature Fir (Abies sp) trees, Birch (Betula sp) and Eurasian aspen (Populus tremula). Forest host to Siberian flying squirrel (Pteromys volans). Estonia, April 2...
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Nick Upton / Siberian flying squirrel (Pteromys volans) caught in emergence trap over nest hole entrance in Aspen (Populus tremula) tree. Muraka Forest Reserve, near Lisaku, Estonia. April.
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Nick Upton / Laptop screen showing trailcam footage of Siberian flying squirrel (Pteromys volans) returning to nest hole in Aspen (Populus tremula) tree. Near Lisaku, Estonia. April 2018.
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Nick Upton / Felled Aspen (Populus tremula) trees with tit nests in hollows. Treeholes suitable for Siberan flying squirrel (Pteromys volans). Near Lisaku, Estonia. April 2018.
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Nick Upton / Siberian flying squirrel (Pteromys volans) emergence trap over entrance to nest hole in old Aspen tree (Populus tremula). Muraka Forest Reserve, near Lisaku, Estonia. April 2018.
