These haunting sounds may travel kilometres under water and can be heard above the surface. H umpback whale songs constantly evolve throughout the mating season. As a theme changes, all the whales of the given group make the same changes in time with the others. This is one of the remarkable mysteries of the animal world. I t was once thought that Humpbacks are stationary when singing but recent evidence suggests that Humpbacks which migrate along the Australian coastlines may sing as they are travelling.
Humpbacks also produce a variety of social sounds made by males and females.
T he larger baleen whales communicate with similar ability and produce sounds far outside the range of human hearing. Recently it was discovered that Blue whales also sing but their 'songs' are almost all below the range of human hearing and very long indeed. A blue whale song may last ten hours with as much as twenty minutes between notes.