David Perpinan / Female Rock sparrow (Petronia petronia) feeding chick inside nest, filmed with an infrared camera, Spain, June.
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Dave Bevan / Slow motion clip of a Blue tit (Cyanistes caeruleus) flying to nest box, enters to feed nestlings and leaves, Carmarthenshire, Wales, UK, June.
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Nick Upton / Common swift (Apus apus) feeding chick in a nest box, filmed using infrared light, Cambridge, England, UK, August.
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Ann & Steve Toon / Spotted eagle owl (Bubo africanus) at nest box, Paternoster, Western Cape, South Africa.
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Ann & Steve Toon / Rock kestrel (Falco rupicolus) at nesting box, Western Cape, South Africa.
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Alan Williams / Red mason bee (Osmia bicornis) female sealing entrance to nest hole in bee nesting box. On wall of house, Cheshire, England, UK. May.
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Steven David Miller / Red-collared lorikeet (Trichoglossus rubritorquis) head peering out of nest box.Territory Wildlife Park, Darwin, Northern Territory, Australia. Captive.
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Phil Savoie / Bird box covered in snow, Montana, USA, December.
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Nick Upton / Researcher using laptop to check trailcam footage of Siberian flying squirrel (Pteromys volans) nest box in mature mixed forest. Near Lisaku, Estonia. April 2018. Model released.
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Nick Upton / Nest box for Siberian flying squirrel (Pteromys volans) in mature mixed forest. Muraka Forest Reseve, near Lisaku, Estonia. April 2018.
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Nick Upton / Researchers carrying equipment prior to fitting nest box for Siberian flying squirrel (Pteromys volans). Mature mixed forest, Estonia. April 2018. Model released.
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Nick Upton / Researchers carrying ladder and nest boxes for Siberian flying squirrel (Pteromys volans). Mature mixed forest, Estonia. April 2018. Model released.
