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| Brief information on Western Bluebirds and how to build a house for them |
| A non-profit educational organization promoting the conservation of bluebirds and other native cavity-nesting birds |
| Articles by Michael and Diane Porter on how to choose and use them, comparison charts of top brands, and how they work |
| An incorporated non-profit organization determined to increase the populations of the three species of bluebirds on the North American continent |
| Bluebird pictures and nestbox plans |
| Images of birds from the United States and Manitoba, Canada |
| Devoted to the preservation and recovery of the Purple Martin through hands-on conservation projects, management of existing breeding sites, and research |
| Information on bluebirds, identification, photos, birds feeder projects, and nest box instructions |
| A Purple Martin organization established in 1962 |
| A specialized and unique group of birders whose goals are to preserve the Purple Martin species and to advance the interest and knowledge of Purple Martins to others |
