Scientists Pinpoint Source Of Antarctic 'Quack'

For decades, a mysterious quacking "bio-duck" has been heard roaming the waters of the Southern Ocean. Now scientists say the source is a whale.

Source: http://www.npr.org/blogs/thetwo-way/2014/04/23/306240733/scientists-pinpoint-source-of-antarctic-quack?ft=1&f=1007

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