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Red-Cockaded Woodpeckers vs Rat Snakes: The Effectiveness of the Resin Barrier
D. Craig Rudolph, Howard Kyle and Richard N. Conner
The Wilson Bulletin
Vol. 102, No. 1 (Mar., 1990), pp. 14-22
Published by: Wilson Ornithological Society
Stable URL: http://www.jstor.org/stable/4162821
Page Count: 9
You can always find the topics here!Topics: Snakes, Trees, Resins, Tree cavities, Woodpeckers, Rats, Tree trunks, Bark, Bird nesting, Wildlife ecology
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Red-cockaded Woodpeckers (Picoides borealis) excavate resin wells in the immediate vicinity of roost and nest cavity entrances. Resin wells are worked regularly, resulting in a copious and persistent resin flow that coats the tree trunk, especially below cavity entrances. Red-cockaded Woodpeckers also scale loose bark from cavity trees and closely adjacent trees. These two behaviors result in smooth, sticky surfaces surrounding cavity entrances. Climbing experiments on cavity, scaled, and control trees using rat snakes (Elaphe obsoleta) demonstrate that these behaviors produce a resinous barrier that is highly effective in preventing predatory snakes from gaining access to active Red-cockaded Woodpecker cavities.
The Wilson Bulletin © 1990 Wilson Ornithological Society