What Spooked The Subs Of The '60s? Quacking Whales

In the '60s, submarines picked up a mysterious quacking sound in the Southern Ocean. This "bio-duck," as it came to be known, has been heard on and off ever since, but scientists haven't been able to trace it — until now. New research shows that the quack is coming from minke whales, but researchers still don't know why.

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