Aðalsteinn Örn Snæþórsson, Þorkell Lindberg Þórarinsson use a telescopic pole and wire noose to catchBrünnich's guillemot (Uria lomvia), common guillemot (Uria aalge). Kittiwake (Rissa tridactyla). Staff from Náttúrustofa Norðausturlands (Northeast Iceland Nature Research Centre) catch seabirds at Skoruvíkurbjarg bird cliffs on Langanes Peninsula, Iceland to fit and replace geolocators to monitor the bird's movements.

Yann Kolbeinsson releases a fulmar (Fulmarus glacialis) captured to replace its geolocator.Staff from Náttúrustofa Norðausturlands (Northeast Iceland Nature Research Centre) catch seabirds at Skoruvíkurbjarg bird cliffs on Langanes Peninsula, Iceland to fit and replace geolocators to monitor the bird's movements.

Aðalsteinn Örn Snæþórsson fits a geolocator to a common guillemot (Uria aalge). Staff from Náttúrustofa Norðausturlands (Northeast Iceland Nature Research Centre) catch seabirds at Skoruvíkurbjarg bird cliffs on Langanes Peninsula, Iceland to fit and replace geolocators to monitor the bird's movements.

Measuring a Kittiwake (Rissa tridactyla). Staff from Náttúrustofa Norðausturlands (Northeast Iceland Nature Research Centre) catch seabirds at Skoruvíkurbjarg bird cliffs on Langanes Peninsula, Iceland to fit and replace geolocators to monitor the bird's movements.

Aðalsteinn Örn Snæþórsson, Þorkell Lindberg Þórarinsson, capture aBrünnich's guillemot (Uria lomvia) to replace geolocator. Staff from Náttúrustofa Norðausturlands (Northeast Iceland Nature Research Centre) catch seabirds at Skoruvíkurbjarg bird cliffs on Langanes Peninsula, Iceland to fit and replace geolocators to monitor the bird's movements.

Yann Kolbeinsson, Chanee Thianthong, taking a blood sample from a Kittiwake (Rissa tridactyla). Staff from Náttúrustofa Norðausturlands (Northeast Iceland Nature Research Centre) catch seabirds at Skoruvíkurbjarg bird cliffs on Langanes Peninsula, Iceland to fit and replace geolocators to monitor the bird's movements.

Simon Evans ringing a Common swift chick (Apus apus) removed briefly from a nest box in All Saints Church belfry with over 40 swift nestboxes, Worlington, Suffolk, UK, July. Model released.

A screaming party of Common swifts flies around a church bell tower at dusk, where a large colony now breeds in over 40 nestboxes behind the window louvres in a village where swifts nearly disappeared when the building housing the last remaining colony was demolished, Worlington, Suffolk. Nikon D500 camera used (NB not all EXIF data correct or recorded by processing software).

Common swift flying the kind of nest site commonly available in the past under tadtitonal roof tiles on an old cottage, Hilperton, Wiltshire, UK, July. Renovated houses and modern constructions often offer no nest sites for them.

Judith Wakelam hand-feeding an orphaned Common swift chick with insect food in her home, Worlington, Suffolk, UK.

A Common swift flying from a nest box attached to the eaves of a cottage after feeding its chicks, Hilperton, Wiltshire, UK. Photographed with a remote camera on a house extension rooftop, triggered by a wireless remote release.

Judith Wakelam releasing an orphaned Common swift chick she has fostered and fed with insects at her home until it was ready to fly, Worlington, Suffolk, UK.