Lonely whale's song remains a mystery
A lone whale with a voice unlike any other has been wandering the Pacific for the past 12 years. Marine biologist Mary Ann Daher of Woods Hole Oceanographic Institution in Massachusetts, US, and her colleagues used signals recorded by the US navy’s submarine-tracking hydrophones to trace the movements of whales in the north Pacific. The partially declassified records show that a lone whale singing at around 52 hertz has cruised the ocean every autumn and winter since 1992. Its calls do not match those of any known species, although they are clearly those of a baleen whale, a group that includes blue, fin and humpback whales.