This time of year, biologist Jim Lind looks forward to sleeping in his own bed. Lind has spent two months living in motels, like a musician out on the road. He's been across northern Minnesota, and into Wisconsin. But Lind isn't *making* music -- he's *listening* to it. He's part of a team from the University of Minnesota in Duluth that's tracking songbird populations in the north woods. It's almost impossible to see birds deep in the forest, so these biologists count birds by ear. Minnesota Public Radio's Chris Julin reports.