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Humpback Whales

Humpback Whales
(Megaptera novaeangliae)

   The Humpback whale is one of the most energetic of the rorquals. It is known for its spectacular breaching, flipper-slapping and lobtailing. It is easily identified at close range by its knobbly head and long flippers. The black and white colouration on the underside of the flukes (tail) allows scientists to distinguish and name individuals all around the world. No two Humpback whales are exactly alike.

   During breeding season the Humpback males are known for singing the longest and most complex songs in the animal kingdom. Humpbacks are highly inquisitive and will approach quite closely, showing little fear of boats.

   The Humpback whale has a more robust body than other rorqual. It's back and flanks are grey or black with an area of white on the throat and belly. It has a slender head which constitutes up to one-third of its total body length. The top of the head is flattened and covered by a number of fleshy knobs or tubercles. Unlike other rorquals the midline ridge on the top of the Humpback's head is indistinct. The lower jaw has a rounded protuberance near the tip and is covered with similar tubercles to those on the head. Baleen plates numbering between 270 to 400 are found on each side of the upper jaw. The plates are relatively short and black or dark grey.

The Humpback has exceptionally long flippers with knobs along the leading edges. While the underside of the flipper is usually white geographical differences have altered the upper side. On the flipper of Pacific Humpback the upper side is usually black whereas in populations of the Atlantic Humpback the upper side is mostly white with black markings.

   Humpback's have 14-35 broad throat groves which extend to the naval. The dorsal fin, placed nearly two thirds along the back, is variable in shape and size from a small triangular knob to a large distinctly sickle-shaped fin. The tail flukes are distinctly notched with trailing edges that are commonly scalloped (S-shaped) with knobs. The back is typically humped in front of the dorsal fin and the tail stock is relatively thin.

   The Humpback has twin blowholes typical of all baleen whales. It's blow appearing as a single bushy spout extending to 3m (10ft) in height.

Subfamily: Megapterinae

Other Names: Hump-backed Whale.

   Humpback whales are wide ranging and can be found virtually worldwide, but with apparent geographical segregation between at least ten populations. Although some mixing does occur between these populations there has probably never been any contact between the Northern and Southern hemispheres. Humpbacks are strongly migratory, seasonally migrating from polar feeding grounds to warm temperate to tropical breeding grounds.

   Estimated at around 10,000 individuals worldwide the Humpback is an 'Endangered Species'. The healthiest populations occur in the western north Atlantic Ocean. A few other areas, include the waters near Beguia, Cape Verde, Greenland, and Tonga.

   Due to their tendency to aggregate on the tropical breeding grounds and to come close to the shore on the polar feeding grounds the Humpback whales were highly vulnerable to whalers. It is likely that more than 100,000 humpbacks were killed by whalers throughout the modern whaling era and, although some stocks seem to be recovering, today's population is still a fraction of its original size. Humpback whales received protection in 1966 and again in 1985 when the International Whaling Commission instituted a moratorium on commercial whaling.

Length: 12-15 metres (40-60 feet) Life-span 70-80 years.

   Humpback whales in the Southern Hemisphere are proving to be different from those north of the equator (the northern species is known as M. n. angliae). The Humpback Whale is unlike any other Rorqual. The body is robust and narrows rapidly in front of the huge tail flukes. The head is broad and rounded, but the median ridge is indistinct and has been replaced by a string of fleshy knobs. Two further lines are arranged along the jaws.

   The fin is small and varies in shape from triangular to shark-like. It is set two-thirds of the way back and mounted on a fleshy platform unlike that of any other Baleen whale. The most characteristic feature of the humpback is its enormous flippers. They are almost a third of total body length, about 5 metres (16 feet) long and heavily scalloped.

   The whale's colour is generally blackish with a white area covering the throat grooves. It has broad flukes with highly scalloped edges, moderately notched. The underside of the flukes are marked with a variable pattern of white, making each whale recognizable at the surface as it throws its tail into the air. The flippers are mottled black and white with white underneath.

   The blow is distinctive, seldom more than 3 metres high (10 feet) and is a single, straight column that spreads at the top, like the spout of a fountain. Breathing sequence usually involves 2 or 3 minutes at the surface, blowing once every 20-30 seconds, followed by a deep 'humpbacked' dive for 3-28 minutes. The fin is seldom seen until the high, rolling dive brings the hump into view before sounding. In warmer water, the number of breaths taken between dives is reduced from an average of 6 to 3.

   Humpbacks often leap clear of the water, usually in an arching backflip, which brings the pale pleats of the throat into view. These whales can often be found lying motionless on the surface with one flipper hoisted like a sail. This raised flipper can slap the water hard, producing a noise like a gun shot. An even louder sound can be made by bringing the tail down sharply upon the water surface. This is called a lobtail.

source"Whales in Danger"


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