For additional information about cavity-nesting birds, nestboxes and related topics, please visit these sites (links will open in a new browser window).  This list is constantly under construction - if you have a site you think we should include, please contact us.
The North American Bluebird Society is a non-profit education, conservation and research organization that promotes the recovery of bluebirds and other native cavity-nesting bird species in North America.  Learn about the different species of bluebirds, how to attract and care for them and download educational materials. provides a wealth of general information on how to attract nesting bluebirds and other small cavity nesters, including distinguishing nests and eggs, heat, dealing with house sparrows, house wrens, nestboxes, etc. 
The Bluebird Nut Cafe is a forum for Bluebird enthusiasts and others who are interested in Bluebirds to to gather information, exchange stories, pictures, advice, tips, and hints.
North American Bluebird Society Affiliates  Check this list to determine if your state or province has a Bluebird Society.
The Bluebird Box The Bluebird Box is the starting point for finding information about bluebirds and other cavity nesting birds.  Articles, Nest box drawings, the Best of Bluebird Mailing Lists Classified, and more are all available right here and for the most part only here.
The Cornell Lab of Ornithology is an online guide to birds and bird watching.  A good bird identification site.
The Purple Martin Conservation Association is a non profit organization dedicated to the preservation of Purple Martins.

The Purple Martin Landlords of North Texas is dedicated to the conservation and preservation of the Purple Martin species.  Information, tips and links related to nestboxes and cavity-nesting birds.  Site contains comprehensive heat test results conducted on nestboxes in various configurations and colors.
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This site was last updated on 01/01/2016