Bit of a different request: Our church is having a community outreach event in early May, and they'd like to include building bluebird houses as a piece of the event.
I am only peripherally involved (featured birding type speaker) - but they asked this evening whether I could find websites, wood sources and other information on bluebird houses. Any recommendations would be appreciated! Al Schirmacher Princeton, MN Mille Lacs & Sherburne Counties

