"Dreadnoughtus" weighed as much as a dozen African elephants or more than seven T-rex," said Dr Lacovara, an associate professor in Drexel University's college of arts and sciences.
The species, whose name means "fear nothing", had a thigh bone that stood just under two metres and neck vertebrae that were almost a metre wide. The bones at the end of its nine-metre long tail had an unusually large surface area to attach muscles, suggesting it was extremely muscular and powerful.
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