Are you interested in building a home for a feathered friend? Audubon has the book for you: the Audubon Birdhouse Book.
The recently updated 2nd edition tells you how to build a birdhouse that actually works and that the birds will use. Whether you want to provide a home for Wrens or Warblers, Flickers or Flycatchers, this is the book that you need.
You can learn more, including how to purchase the book, at the Audubon web site.