http://www.vpr.net/audio/programs/84/2012/10/VTED_1023_20012.mp3
Flocks of birds are crossing the skies. Which means it's time for the fall migration bird show. Naturalist and bird enthusiast Bridget Butler joins us to explore mysterious bird calls and bird behavior, explain how birds know when to migrate and the science behind the tell-tale V of Canada geese in migration.
