Description
Like the orca, the long-finned pilot whale is really a dolphin. It has a bulbous forehead and is jet black or dark grey with grey or white markings on throat and belly and sometimes behind dorsal fin and eye. The dorsal fin is sickle shaped. The long flippers are about 15 to 20 percent of total body length. It is sometimes known as the pothead whale because the shape of its head reminded early whalers of black cooking pots. Females reach sexual maturity at about 3.7 m (12 ft.) and 6 to 7 years of age. Males need about twice as long to reach sexual maturity at about 4.6 m (15 ft.) and 12 years of age. An adult whale weighs 1.8 (3600 lbs.) to 3.5 (7000 lbs.) tonnes.
They are very social, family animals and may travel in groups of up to a hundred. A dominant female is mostly acting as a leader. These groups socialize with common bottlenose dolphins, Atlantic white-sided dolphins and Risso's dolphins. An adult whale needs about 50 kilograms (110 pounds) of food a day, which consists mostly of cephalopods and to a lesser amount of fish. Pilot whales generally take several breaths before diving for a few minutes. Feeding dives may last over ten minutes. They are capable of diving to depths of 600 metres (approximately 1900 feet), but most dives are to a depth of 30–60 metres.
Gestation lasts approximately 12 to 15 months and calving occurs once every 3 to 5 years. Calves are generally 1.8 meters (6 feet) at birth, and weigh about 102 kilograms (225 pounds). The calf nurses for up to 27 months, with some evidence for longer lactation and extensive mother calf bonds. Most calves are born in the summer, though some calving occurs throughout the year. The males may compete for mates with fights involving butting, biting, and ramming. Mating also involves these activities, and some females carry scars from bites inflicted by males during the breeding season. Females have been observed to have calves as late as 55 years old, and lactate as late as 61. This evidence indicates that females may nurse their last calf until puberty (up to 10 years in males).
Communication and echolocation consist of a wide sound range from three to 18 kHz. These sounds are produced 14 to 40 times a minute.
Long-finned pilot whales are very active and can often be seen lobtailing and spyhopping. The younger ones also breach. Full grown females have been observed breaching, but this is very rare in adult males. Long-finned pilot whales often strand themselves on beaches - because they have strong family bonds, when one animal strands, the rest of the pod tends to follow. These whales have also been observed babysitting calves in the pod while the mother goes deep to feed. It has been observed in the Gulf of Saint Laurence where one female was babysitting up to three calves at a time.
Read more about this topic: Long-finned Pilot Whale
Famous quotes containing the word description:
“An intentional object is given by a word or a phrase which gives a description under which.”
—Gertrude Elizabeth Margaret Anscombe (b. 1919)
“To give an accurate description of what has never occurred is not merely the proper occupation of the historian, but the inalienable privilege of any man of parts and culture.”
—Oscar Wilde (1854–1900)
“The great object in life is Sensation—to feel that we exist, even though in pain; it is this “craving void” which drives us to gaming, to battle, to travel, to intemperate but keenly felt pursuits of every description whose principal attraction is the agitation inseparable from their accomplishment.”
—George Gordon Noel Byron (1788–1824)