00500nam a2200097Ia 4500 170517s9999 xx 000 0 und d Why Birds Sing Inspired 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.... Science. http://topdocumentaryfilms.com/why-birds-sing/ 334515 334515 0 0 0 CL CL 2017-05-17 0 2017-05-17 00:00:00 2017-05-17 DF