'Bio-duck' ocean sound caused by Minke whales: Study
Despite all the scientific development that the human have made over the last few years Earth and solar continues to throw many unresolved mysteries. Of them the one that had kept researchers and submarine crews baffled for years was the mysterious quacking sound in the icy waters off the coast of Antarctica.
Since the 1960s when it was picked up by Cold War patrol, the bio-duck as many called had left many stumped. Over the years many stories did the round, forcing scientists to know the real reason of Antarctic quack. If some thought it to be a secret Soviet sub many were convinced it was nothing but a sound by an animal. However, scientists were unable to pinpoint the exact source of the sound until a team from Duke University landed at the spot last year during the Antarctic summer to study the behaviour of whales. It was during their study that researchers tried something new like attaching an instrument package to one of the whales using suction cups. Also on board was placed a microphone.
Denise Risch, a marine biologist with the National Oceanographic and Atmospheric Administration, said: "It goes quack, quack, quack, quack. It has this almost mechanical feel to it. They don't sound alike, but the pulses are exactly 3.1 seconds apart from each other."
Source : http://nvonews.com/bio-duck-ocean-sound-caused-by-minke-whales-study/
