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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Florian Möllers / Mallard (Anas platyrhynchos), female nesting in window box of a 4th floor flat, Berlin, Germany, June
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Florian Möllers / Photographer Florian Mollers having breakfast beside a female Mallard (Anas platyrhynchos) nesting in window box of a 4th floor flat, Berlin, Germany, June. Model released
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Wild Wonders of Europe / Varesvuo / Red-footed falcon (Falco vespertinus) male at nesting box in Hortobagy NP, Hungary, May 2008
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Flip de Nooyer / Eurasian Kestrel (Falco tinnunculus) group of five juveniles in nesting box, Europe
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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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Nick Upton / Common swift (Apus apus) flying to a nest box attached to the eaves of a cottage with a feather and straw in its beak to build its nest with, Hilperton, Wiltshire, UK, May 2018.
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Nick Upton / Two nest boxes for Common swifts (Apus apus) attached under the eaves of a block of flats, with a nesting Swift peering from one, Edgecombe, Cambridge, UK, July.
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Nick Upton / Six nest boxes for Common swifts (Apus apus) in a roof space with swift brick entrance holes and perspex backs so nesting birds can be monitored by a cctv camera and a call playback system, with one n...
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Philippe Clement / Great tit (Parus major) bringing food to nestbox to feed chicks, Belgium, April.
