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Blue Whales most commonly live alone or with one other individual. It is not known whether those that travel in pairs stay together over many years or form more loose relationships. In areas of very high food concentration, as many as 50 Blue Whales have been seen scattered over a small area. However, they do not form large close-knit groups as seen in other baleen species.
===Size===
The Blue Whale is believed to be the largest animal ever to have lived on Earth. The largest known [[dinosaur]] of the [[Mesozoic era]] was the ''[[Argentinosaurus]]'', which is estimated to have weighed up to 90 [[tonne]]s (100 [[short ton]]s). There is some uncertainty about the biggest Blue Whale ever found. Most data comes from Blue Whales killed in [[Antarctic]] waters during the first half of the twentieth century and was collected by whalers not well-versed in standard zoological measurement techniques. The longest whales ever recorded were two females measuring 33.6 m and 33.3 m (110 ft 3 in and 109 ft 3 in) respectively. However, there are some disputes over the reliability of these measurements. The longest whale measured by [[scientist]]s at the American [[National Marine Mammal Laboratory]] (NMML) was 29.9 m long (98 ft) — about the same length as a [[Boeing 737]] aeroplane or three [[double-decker bus]]es.
A Blue Whale's [[tongue]] is about the size of an elephant and 50 humans could stand in its mouth: although the mouth is as large as a small garage, the dimensions of its throat are such that a blue whale cannot swallow an object wider than a beach ball <ref>Blue Planet: Frozen seas (BBC documentary)</ref>. Its [[heart]] is close to the size of a small car and is the [[largest body part|largest]] known in any animal. A human baby could squeeze into a Blue Whale's [[aorta]], which is about 23 centimetres (9 inches) in diameter.<ref>{{cite web|url=http://www2.ucsc.edu/seymourcenter/PDF/2.%20Ms.%20B%20measurements.pdf|title=Ms. Blue's Measurements|author=Caspar, Dave|date=2001 April|accessdate=2006-09-01|publisher=Seymour Center, University of California, Santa Cruz.}}</ref> During the first 7 months of its life, a Blue Whale calf drinks approximately 400 litres (100 US gallons) of milk every day. Blue Whale calves gain [[body weight|weight]] as quickly as 90 kg (200 pounds) every 24 hours. Even at birth, they weigh up to 2700 kg (6000 lb) – the same as a fully-grown [[hippopotamus]].
Blue Whales are very difficult to weigh because of their massive size. Most Blue Whales killed by whalers were not weighed as a whole, but cut up into manageable pieces before being weighed. This caused an underestimate of the total weight of the whale, due to loss of blood and other fluids. Nevertheless, measurements between 150 and 170 tonnes (160 and 190 [[short ton]]s) were recorded of animals up to 27 m (88 ft 6 inches) in length. The weight of a 30 m (98 ft) individual is believed by the NMML to be in excess of 180 tonnes (200 [[short ton]]s). The largest Blue Whale accurately weighed by NMML scientists to date was a female that weighed 177 tonnes (196 [[short ton]]s).
===Life cycle===
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