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It has been shown that backyard bird conservation has made a difference in certain bird populations.  With this carefully researched, handsomely illustrated, and easy-to-use guide, both suburban and rural residents alike now have a compendium of information that will allow you to provide appropriate housing for cavity nesting birds in your area.  Join that conservation effort and attract fascinating birds like bluebirds, wood ducks, purple martins, and American kestrels to your backyard.