00469nam a2200085Ia 4500008004100000245001900041300025900060650001300319856005100332170517s9999    xx            000 0 und d  aWhy Birds Sing  aInspired by musician and eco-philosopher David Rothenberg's book of the same title, this documentary explores the intriguing, charming, complex and often conflicting theories on why birds sing like they do and why humans are so attracted to the sound....  xScience.  uhttp://topdocumentaryfilms.com/why-birds-sing/