Nick Upton / Researchers fitting Siberian flying squirrel (Pteromys volans) nest box to tree. Mature mixed forest, Estonia. April 2018. Model released.
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Nick Upton / Researchers fitting Siberian flying squirrel (Pteromys volans) nest box to mature tree and recording position on GPS unit. Estonia. April 2018. Model released.
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Nick Upton / Forester hanging Siberian flying squirrel (Pteromys volans) nest box in mature mixed forest, Estonia. April 2018. Model released.
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Nick Upton / Interior of a nest box used by Siberian flying squirrel (Pteromys volans) with stored Aspen (Populus tremula) catkins. Estonia. April.
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Konrad Wothe / Starling (Sturnus vulgaris) at nestbox in garden, Bavaria, Germany . April
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David Tipling / Blue tit (Cyanistes caeruleus) at nest box Kettlestone Norfolk, England, UK.
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Roger Powell / Old Goldeneye Nestbox crafted from a log and chained to the side of a lodge to protect it from Wolverines. Kaalimaa, Pokka, Inari, Lapland, Finland
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Roger Powell / Old Goldeneye Nestbox crafted from a log and chained to the side of a lodge to protect it from Wolverines. Kaalimaa, Pokka, Inari, Lapland, Finland, June.
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Kim Taylor / Tree bumblebee (Bombus hypnorum) worker approaching nest in bird box. Surrey, England, UK, May.
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Kim Taylor / Tree bumblebee (Bombus hypnorum) workers patrolling entrance to nest in bird box. Surrey, England, UK, May. Long exposure.
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Kim Taylor / Tree bumblebee (Bombus hypnorum) worker approaching nest in bird box. Surrey, England, UK, May.
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Chris Gomersall / Common kestrel (Falco tinnunculus) adult male at nest box. Hula Valley, Israel. January. Natural predators are encouraged by the provision of nest boxes by local farmers.
