Humback Whale - Photo: Cetacea

Humback Whale – Photo: Cetacea

Latin name: Megaptera Novaeangliae

The Humpback Whale is a widely distributed species, occurring seasonally in all oceans from the Arctic to the Antarctic, with distinct populations located in virtually every sea. All populations of Humpback Whale undertake vast migrations between breeding and feeding grounds, the most famous – and longest – of which is probably made by the Hawaii Humpbacks, who travel to the Bering Strait and Alaska’s Glacier Bay every year to feed.

Classification

The Humpback Whale, Megaptera novaeangliae, was classified by German naturalist Borowski, meaning ‘Big-Winged New Englander’, referring to the size of the whale’s huge flippers and one of the first sightings of this species, off New England, America.

Local Names

Baleine à bosse or Megaptère (France); Jorobada (Spain); Knølhval (Norway); Hump-Backed Whale. The common name clearly refers to the species’ method of diving, when it lifts its dorsal in such a way as to emphasize the hump before it.

Description

This is a well-known whale, with a stout body and very long flippers that have bumps and lumps upon which barnacles may grow. The head is rounded and flat, apart from the raised lumps (‘tubercles’) which are also found on the lower jaw. The dorsal fin is varied in size and shape from individual to individual, and tail flukes are large and almost ‘wing-shaped’. The Humpback Whale is black to blue-black in colour, with pale to white undersides that can show black markings that are varied according to individual. It is with these markings that individual whales can be indentified. They measure between 12-14m in length, with the females generally larger than the males, and they weigh between 25-30 tonnes. There are 12-36 throat grooves and between 540-800 baleen plates per animal, the longest reaching between 80-100cm.

Recognition at Sea

This is a species that it unmistakable at sea, through the combination of the big, sometimes bushy blow, dark skin colour, the shape of the dorsal, and its habit of raising the flukes on diving. Lobtailing, flipper-slapping and breaching (these whales are very acrobatic) are also other giveaways. As Mark Carwardine said in On The Trail Of The Whale, “look for a giant black cadillac with a radiator problem”.

Habitat

The Humpback Whale is found from the topics to the polar waters, and spends a lot of time in much shallower, offshore waters than other rorquals. However, they also cross thousands of kilometres of open ocean when migrating between summer and winter grounds.

Food & Feeding

Humpback Whales tend to feed within 50m of the water’s surface, taking krill and shoaling fish such as herring, sandeel, capelin, and mackerel. This is another ‘gulping’ whale, filtering food from masses of tonnes of water through the baleen plates after engulfing a mouthful. Unlike other rorquals, the Humpback has many varied methods of feeding, including lunge-feeding, tail-flicking and bubble-netting, the latter of which is a favourite subject for nature documentaries. When lunge-feeding, the whale swims through a shoal of its prey with its mouth open, often exploding at the surface with both food and water pouring from the mouth’s sides. When tail-flicking, the whale lies in a belly-up position just below the surface with its mouth open, and then flicks its tail clear of the water, casting the prey up into the air and down into its mouth. Bubble-netting, though, is by far the most outstanding. The whale dives beneath a shoal of prey and slowly begins to spiral upwards, blowing bubbles in a circular shape (and emitting a steam-engine sound) as it does so. These bubbles tend to congregate the prey in the centre of the circle, and the ones blown at the bottom of the spiral reach the surface at the same time as the ones blown last. Then the whale returns to beneath the prey, and swims up through the bubble-net into the centre with its mouth open to gulp up all the prey, as shown.

Behaviour

Humpback Whales often congregate in large, loose groups of tens of animals for breeding and feeding, but within these groups they move individually or in the companionship of between 1-3 others. On breeding grounds the well-known ‘gentleness’ of these animals is abandoned, with males becoming very aggressive as they attempt to claim females for their own. It is with these breeding grounds that the Humpbacks are most commonly associated with their ‘singing’, which is well-known for being included on the Voyager space mission, along with the golden plaque. The songs can vary from 35 minutes to days in length, with pauses only for breath. It is the males that sing in this fashion. The most acrobatic of large whales, Humpbacks are also well-known for their breaches – one was recorded breaching 200 times in a row – lob-tailing and flipper-slapping. Some Humpbacks in Alaska have been seen rolling over icebergs in play.

Longevity

Approximately 50 years.

Estimated Current Population

20,000 animals. Vulnerable.

The Influence of Man

Humpbacks were taken on their migrations between their feeding and breeding grounds, as well as on these grounds. Slower, more easily found and less scared than other rorquals, they became a prime target during the modern era of whaling. Between 1900 and 1940, over 100,000 Humpbacks were taken in the Southern Hemisphere alone, with Norther stocks already diminishing. By 1966, however, the species recieved full protection from commercial whaling, although they are still threatened by entrapment in fishing nets. They were brought even further to the forefront of the public’s mind with the fourth installment of the Star Trek films, The Voyage Home.

Geographic Distribution

Humpback Whale Habitat

Humpback Whale Habitat