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21 meters is about one-and-three-fifths times as tall as a Brachiosaurus
In other words, the height of a Brachiosaurus is 0.630 times that amount.
(based on comparable bone measurements, height to head)
Dinosaurs in the genus Brachiosaurus had an estimated height (at the head with neck fully extended) of up to 13 m. A resin cast of the first Brachiosaurus specimen, owned by the Field Museum in Chicago, is currently on display at the O'Hare International Airport.
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