I am interested in Bill Mueller's idea to have an MP3 player attached to a martin house to play calls to attract them. Powering the MP3 player is an issue. I was thinking a photovoltaic cell might work, but have no idea on cost, durability, reliability, and compatibility with an MP3 player. Please back channel with advice. --- Paul Hunter, Whitefish Bay, Milwaukee County Secretary, Milwaukee Olmsted Bird Conservation Alliance of Wisconsin http://home.roadrunner.com/~phunter1/MOBCAW.html ===================================================== #################### You received this email because you are subscribed to the Wisconsin Birding Network (Wisbirdn). To UNSUBSCRIBE or SUBSCRIBE, use the Wisbirdn web interface at: //www.freelists.org/list/wisbirdn. To set DIGEST or VACATION modes, use the Wisbirdn web interface at: //www.freelists.org/list/wisbirdn. Visit Wisbirdn ARCHIVES at: //www.freelists.org/archives/wisbirdn.