英语听力精选进阶版 14406

（单词翻译）

Mystery of ocean 'duck' sound solved

Summary

25 April 2014

A sound like a duck heard in the Southern Ocean has confused scientists for 50 years. But the mystery has now been solved, according to research published in the Royal Society journal Biology Letters.

Reporter:

Rebecca Morelle

Report

This is the noise that's puzzled scientists for more than 50 years. The mysterious sound can be heard in the winter in the seas around Antarctica and Australia.

It's nicknamed "the bio-duck" by those who think it sounds like a duck quacking¹.

Now researchers say acoustic² recorders attached to two Antarctic minke whales have revealed that the bizarre noise is the animal's underwater chatter³.

Scientists say solving this long-standing mystery will help them to learn more about these little-studied mammals and help them to establish where the whales can be found.