blue whale


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blue whale,

a baleen whalewhale,
aquatic mammal of the order Cetacea, found in all oceans of the world. Members of this order vary greatly in size and include the largest animals that have ever lived. Cetaceans never leave the water, even to give birth.
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, Balaenoptera musculus. Also called the sulphur-bottom whale and Sibbald's rorqual, it is the largest animal that has ever lived. Blue whales have been known to reach a length of 100 ft (30.5 m) and to weigh up to 200 tons (180 metric tons), but the typical size is about 70–90 ft (21–27 m) and 100–150 tons (90–135 metric tons). The blue whale is slate blue in color and has a dorsal fin. It is toothless and has fringed baleen, or whalebone, plates in its mouth, which act as a food strainer. As water is expelled from the whale's mouth, plankton is trapped behind the strainer. The neck of the blue whale has 80 to 100 conspicuous furrows called ventral grooves, which alternately expand and contract as the animal takes in and expels water. The blue whale is cosmopolitan in distribution. In summer it inhabits polar seas, feeding in the water of melting icepacks; in winter it migrates to warmer latitudes, occasionally reaching the equator. Mating occurs at the end of winter, with a single calf born every second or third year, after a gestation period of 10 to 11 months. The calf is nursed for 6 months and reaches puberty in about 3 years. Blue whales may live 100 years or more. Because of extensive whalingwhaling,
the hunting of whales for the oil that can be rendered from their flesh, for meat, and for baleen (whalebone). Historically, whale oil was economically the most important. Early Whaling

Whaling for subsistence dates to prehistoric times.
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, their numbers have been reduced from an estimated 400,000 to between 10,000 and 25,000, and they are listed as endangered. In 2014 the California population, which ranges along W North America, was determined by researchers to have recovered to sustainable levels. They are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Mammalia, order Cetacea, family Balaenopteridae.

Bibliography

See G. C. Small, The Blue Whale (1971).

blue whale

the largest mammal: a widely distributed bluish-grey whalebone whale, Sibbaldus (or Balaenoptera) musculus, closely related and similar to the rorquals: family Balaenopteridae
References in periodicals archive ?
Its sister rig Blue Whale 1 has been used in China's first test exploration for gas hydrate, or combustible ice, in the South China Sea from May to July.
Earlier on September 15, the apex court had issued a notice to the Centre in connection with a plea seeking a complete ban on the Blue Whale Challenge.
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The government should take strict measures to leash Blue Whale gamers.
He further mentioned, we advise our readers to keep an eye on social media platforms and report to Pakistan's Cyber Crime cell if they come across groups that are spreading Blue Whale Game Challenges or ideology in Pakistan.
Tasks in The Blue Whale Challenge include things like self-harm and waking up in the middle of the night to watch psychedelic horror videos.
Parents also need to keep themselves educated and updated regarding this game as the Blue Whale Challenge is designed to drain one's self confidence, and leave them in a state of depression where one thinks suicide is the only way.
Sri Lanka BLUE whales can migrate big distances, but Sri Lanka's population tend to stick around for long periods in Mirissa on the south coast, with most sightings from November to April.
Russian national Philipp Budeikin, aged 22, claims to have invented the Blue Whale Game
Hope the blue whale skeleton at the Natural History Museum
Yep, the 26-metre-long star attraction, whose replica skeleton arrived in 36 packing cases in 1905, is to be replaced by that of a huge blue whale, which in turn has been gathering dust in the museum for more than 100 years.
Five pre-trial investigations over the online game Blue Whale, that leads teenagers to commit suicide, have been launched in Lithuania over the past two weeks.