Use perch-deterrents to stop raptors perching on pylons
Overall effectiveness category Likely to be beneficial
Number of studies: 1
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Background information and definitions
Preventing raptors from landing on pylons at all may reduce electrocution, for example, perch-deterrent power lines have spikes and pole caps on the pylons to deter birds.
Supporting evidence from individual studies
A controlled study from September-August in 2006-2007 in shrubland in Wyoming, USA (Slater & Smith 2010), found that raptor activity and predation rates were significantly lower near a 24.9 km perch-deterrent line, compared to a 16.4 km section of control line (42 sightings vs. 551 and 69 prey items found vs. 277). Golden eagles Aquila chrysaetos and common ravens Corvus corax were the species most commonly observed successfully overcoming deterrent devices (76% of deterrent-line sightings). More raptors perched on wires (rather than pylons) on perch-deterrent lines (228 compared to 11 sightings on control lines; 68% of sightings were rough-legged hawks Buteo lagopus).
Where has this evidence come from?
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This Action forms part of the Action Synopsis:Bird Conservation
Bird Conservation - Published 2013