Nick Upton / Old wooden church and belfry with thatched roofs from Masuria, now within the Ethnographic Park, Olsztynek, Poland, September 2017.
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Nick Upton / People watching Swifts (Apus apus) flying around Holy Trinity church during a swift walk organised by the local swift group, Bradford-on-Avon, Wiltshire, UK, June. Digital composite. Model released.
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Nick Upton / Common swift (Apus apus) flying to its nest in a Swift nest box in the belfry of All Saints Church, Worlington, Suffolk, UK, July.
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Nick Upton / Two Common swift eggs (Apus apus) in a nest box in a church belfry, inspected during a ringing study, Worlington, Suffolk, UK, July.
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Nick Upton / All Saints Church which has over 40 swift nestboxes in the belfry and a thriving colony of breeding Common swifts (Apus apus), Worlington, Suffolk, UK, July.
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Nick Upton / Two recently hatched Common swift chicks (Apus apus) in a nest box in a church belfry, inspected during a ringing study, Worlington, Suffolk, UK, July.
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Nick Upton / Two recently hatched Common swift chicks (Apus apus) in a nest box in a church belfry, inspected during a ringing study, Worlington, Suffolk, UK, July.
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Nick Upton / Young Common swift chick (Apus apus) removed briefly from a nest box being ringed by Simon Evans in a church belfry, Worlington, Suffolk, UK, July. Model released.
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Nick Upton / Simon Evans taking a Common swift chick (Apus apus) from a nest box in All Saints Church belfry briefly to ring it, Worlington, Suffolk, UK, July. Model released.
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Nick Upton / Nest box for Common swifts (Apus apus) carried by Roger Becket into Holy Trinity church to be fitted in the bell tower, Bradford-on-Avon, Wiltshire, UK, June. Model released.
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Nick Upton / Common swift (Apus apus) call playback system positioned and turned on successfully by Roger Becket and Peter Grayshon below a nest box they've just fitted into a louvred window in the bell tower of H...
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Nick Upton / Nest box for Common swifts (Apus apus) carried by Roger Becket and Peter Grayshon into Holy Trinity church to be fitted in the bell tower, Bradford-on-Avon, Wiltshire, UK, June.