"Sue" is the nickname given to FMNH PR 2081, which is the largest, most extensive and best preserved Tyrannosaurus rex specimen ever found. It has a length of 12.3 metres (40 ft), stands 4 metres (13 ft) tall at the hips, and was estimated to have weighed more than 6.4 metric tons when alive.[3] 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 $8.36 million,[4][5] the highest amount ever paid for a dinosaur fossil,[6] and is now a permanent feature at the Field Museum of Natural History in Chicago, Illinois.[7]