A whale with a mysterious singing voice that matches no other has been spotted cruising the ocean alone every autumn and winter since 1992, singing at a frequency of 52 hertz. Other whales sing at between 15 and 20 hertz. The routes taken by the mammal also do not match migration patterns of other species. But US marine biologist Mary Anne Daher said the calls were clearly that of a baleen, the family that includes blue and humpback whales. She doubts the whale belongs to a new species, although no similar call has been anywhere else, New Scientist reported.

I thought this was interesting for the frequency/migration difference and whether it has anything to do with the magnetic field changes