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Providing evidence to improve practice

Action: Bury or isolate power lines to reduce incidental bird mortality Bird Conservation

Key messages

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A single before-and-after trial in Spain showed a dramatic increase in the survival of juvenile Spanish imperial eagles Aquila adalberti following the burial or isolation of power lines.


Supporting evidence from individual studies


A before-and-after trial in the wetlands of the Doñana National Park (Ferrer & Hiraldo 1991), Andalusia, Spain, found that six-month survival for radio-marked juvenile Spanish imperial eagles  Aquila adalberti increased from 18% of 17 individuals in 1986-7 to 80% of 15 in 1988-9 following the isolation or burial of previously identified dangerous power lines. This study discusses other eagle management techniques, described in ‘Add perches to electricity pylons to reduce electrocution’, ‘Use signs and access restrictions to reduce disturbance at nest sites’, ‘Foster eggs or chicks with wild conspecifics’ and ‘Remove/treat endoparasites’.


Referenced papers

Please cite as:

Williams, D.R., Child, M.F., Dicks, L.V., Ockendon, N., Pople, R.G., Showler, D.A., Walsh, J.C., zu Ermgassen, E.K.H.J. & Sutherland, W.J. (2019) Bird Conservation. Pages 141-290 in: W.J. Sutherland, L.V. Dicks, N. Ockendon, S.O. Petrovan & R.K. Smith (eds) What Works in Conservation 2019. Open Book Publishers, Cambridge, UK.