This fossil is the titanosaur’s femur (thigh bone). It is 8 feet long. Scientists used the relationship between the circumference of the femur and humerus (upper arm bone) to estimate the animal’s weight at around 70 tons.
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Title: Titanosaur femur
Creator: Photo: AMNH/D. Finnin
Location: Wallach Orientation Center, 4th floor; American Museum of Natural History