<Tr> <Th> Date discovered </Th> <Td> August 12, 1990 </Td> </Tr> <Tr> <Th> Discovered by </Th> <Td> Susan Hendrickson </Td> </Tr> <P> 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 was discovered in August 1990, by Sue Hendrickson, an explorer and fossil collector, and was named after her . After ownership disputes were settled, the fossil was auctioned in October 1997, for US $8.3 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 . </P> <P> During the summer of 1990, a group of workers from the Black Hills Institute, located in Hill City, searched for fossils at the Cheyenne River Indian Reservation in western South Dakota near the city of Faith . By the end of the summer, the group had discovered Edmontosaurus bones and was ready to leave . However, a flat tire was discovered on their truck before the group could depart on August 12 . While the rest of the group went into town to repair the truck, Sue Hendrickson decided to explore the nearby cliffs that the group had not checked . As she was walking along the base of a cliff, she discovered some small pieces of bone . She looked above her to see where the bones had originated, and observed larger bones protruding from the wall of the cliff . She returned to camp with two small pieces of the bones and reported the discovery to the president of the Black Hills Institute, Peter Larson . He determined that the bones were from a T. rex by their distinctive contour and texture . Later, closer examination of the site showed many visible bones above the ground and some articulated vertebrae . The crew ordered extra plaster and, although some of the crew had to depart, Hendrickson and a few other workers began to uncover the bones . The group was excited, as it was evident that much of the dinosaur had been preserved . Previously discovered T. rex skeletons were usually missing over half of their bones . It was later determined that Sue was a record 90 percent complete by bulk, and 73% complete counting the elements . Scientists believe that this specimen was covered by water and mud soon after its death which prevented other animals from carrying away the bones . Additionally, the rushing water mixed the skeleton together . When the fossil was found the hip bones were above the skull and the leg bones were intertwined with the ribs . The large size and the excellent condition of the bones were also surprising . The skull was 1,394 mm (54.9 in) long, and most of the teeth were still intact . After the group completed excavating the bones, each block was covered in burlap and coated in plaster, followed by a transfer to the offices of The Black Hills Institute where they began to clean the bones . </P>

What type of dinosaur is sue at the field museum in chicago