NOAA Fisheries scientists collect population information on blue whales from various sources and present these data in an annual stock assessment report . The flukes of a Blue Whale can be up to seven meters wide and the muscle running from the dorsal fin to fluke is known as the peduncle, it is the most powerful muscle in the entire animal kingdom. The maximum weight of one blue whale is the same weight as about 40 African elephants. The blue whale is the largest animal on the planet, weighing as much as 200 tons (approximately 33 elephants). Even dinosaurs didn’t reach that size – for instance, it’s nearly 20 times heavier than a T. rex ! Blue whales can grow to over 33 metres (around 100ft) in length, which is over twice as long as a t-rex dinosaur – and makes them the largest animal species on Earth! Bigger than any dinosaur to have ever lived, the Blue Whale averages 22-30 meters in length with a body weight of 90-120 tonnes! The Blue Whale is not only the largest whale species, but the largest mammal on Earth. A new survey led by the British Antarctic Survey (BAS) indicates that blue whales and other large whale species are making a welcome comeback in Antarctic waters. They are the loudest animals on Earth and are even louder than a jet engine. Imagine a creature the size of 2 1/2 school buses laid end-to-end and you'll get a sense of the size of the blue whale. The blue whale is the Largest animal ever, some specimens weighing in at a colossal 200 tonnes (440,000 lb), although 100–150 tonnes (200,000–300,000 lb) is the average. A blue whale's heart alone is about the size of a small car and weighs about 1,000 pounds. Blue Whale . Determining the size of the blue whale population—and whether it is increasing or decreasing—helps resource managers assess the success of the conservation measures enacted. Blue whale size. 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