So far, biologists have not been able to explain with any degree of certainty why whales 'sing'. It is thought that the sounds they make are primarily for communication, but they also seem to contribute to a whale's development and well being.
Researches speak of whale 'song' because these giants of the sea make sound patterns that are regular and predictable. Male humpback whales, for example, only produce certain sequences of sounds during the mating season, presumably because this special song plays a central role in finding a mate. It is still unclear, however, whether this display is aimed at females or potential male rivals. Humpback whales also use individual sounds that are not part of complex songs to mark out their territory or when hunting in groups.