The humpback whale ("Megaptera novaeangliae") is a species of baleen whale. It is one of the larger rorqual species, with adults ranging in length from and weighing around . 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. All the males in a group will produce the same song, which is different each season. Its purpose is not clear, though it may help induce estrus in females.