A researcher reopened a decades-old study to demystify strange noises captured in the great depths of the Soutern Ocean, but in vain.

The report focuses on birds that must breed and feed in specific habitats such as forests, grasslands and coastal regions.

In the Antarctic depths, a sound like a giant duck’s quack echoed, baffling humans since the 1960s. Dubbed the Bio-Duck, its origin sparked decades of mystery, hinting at something otherworldly ...

Individual sounds: bicycle bell and bicycle, rowing boat, ducks. Rhyme/song Five (four, three, two, one) little ducks went swimming one day, Over the hill and far away, Mother duck said Quack ...