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Bill Simpson looks inside a fossil of a Tyrannosaurus rex known as "Sue", before removing its forelimb to be used for research at the Field Museum in Chicago, Illinois, U.S., October 6, 2016. “Sue” is the nickname given to FMNH PR 2081, which is the largest, most extensive and best preserved Tyrannosaurus rex specimen ever found at over 90% recovered by bulk. It has a length of 12.3 meters (40 ft), stands 3.66 m (12 ft) tall at the hips, and was estimated to have weighed around 6.4 to 10.2 metric tons when alive. It was discovered in the summer of 1990, by Sue Hendrickson, a paleontologist, and was named after her. After ownership disputes were settled, the fossil was auctioned in October 1997, for US $7.6 million, the highest amount ever paid for a dinosaur fossil, and is now a permanent feature at the Field Museum of Natural History in Chicago, Illinois. (Photo by Jim Young/Reuters)
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