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Providing evidence to improve practice

Individual study: Effectiveness of restrictor plates in preventing damage of red-cockaded woodpecker Picoides borealis cavities by pileated woodpeckers Dryocopus pileatus at Angelina National Forest, Texas, USA

Published source details

Saenz D., Conner R.N., Shackelford C.E. & Rudolph D.C. (1998) Pileated woodpecker damage to red-cockaded woodpecker cavity trees in eastern Texas. Wilson Bulletin, 110, 362-367


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Protect nest sites from competitors Bird Conservation

A replicated study in 1996 in a longleaf pine Pinus palustris forest in eastern Texas, USA (Saenz et al. 1998) found that fitting restrictor plates (steel plates that stop entrance holes being enlarged) to red-cockaded woodpecker Picoides borealis nesting cavities significantly reduced the proportion of holes that were enlarged (and rendered unsuitable) by larger pileated woodpeckers Dryocopus pileatus, compared to control cavities (2% of restrictor plate-fitted cavities enlarged, n = 54; 41% of control cavities enlarged, n = 276). The authors note that preventing hole enlargement may prevent other species, such as American kestrels Falco sparverius and eastern screech-owls Megascops asio, from nesting in woodpecker cavities too.