More info: The Eastern bluebird is found in every county of the state of Tennessee and lots of state and local parks have "bluebird trails" with multiple bluebird houses.
Video showing eastern bluebirds:
Articles on making and maintaining Bluebird Nest Boxes:
Nest Box Basics - Michigan bluebird Society - michiganbluebirds.org
How to make an Eastern Bluebird Birdhouse - 70birds.com/
Additional Information :
Eastern Bluebird - American Bird Conservancy - abcbirds.org
How To Attract Bluebirds To Your Garden - southernliving.com
Eleven types of Blue Birds of North America - avibirds.com
North American Bluebird Society - nabluebirdsociety.org
Animal Diversity Web - animaldiversity.org