<Li> Kyphobalaena longimana Van Beneden, 1861 </Li> <Li> Megaptera versabilis Cope, 1869 </Li> <P> The humpback whale (Megaptera novaeangliae) is a species of baleen whale . One of the larger rorqual species, adults range in length from 12--16 m (39--52 ft) and weigh about 36,000 kg (79,000 lb). The humpback has a distinctive body shape, with long pectoral fins and a knobbly head . It is known for breaching and other distinctive surface behaviors, making it popular with whale watchers . Males produce a complex song lasting 10 to 20 minutes, which they repeat for hours at a time . Its purpose is not clear, though it may have a role in mating . </P> <P> Found in oceans and seas around the world, humpback whales typically migrate up to 25,000 km (16,000 mi) each year . Humpbacks feed in polar waters, and migrate to tropical or subtropical waters to breed and give birth when they fast and live off their fat reserves . Their diet consists mostly of krill and small fish . Humpbacks have a diverse repertoire of feeding methods, including the bubble net technique . </P>

What is the average weight of a humpback whale