Jane the nickname given to a fossil specimen of small tyrannosaurid dinosaur (probably a juvenile Tyrannosaurus rex, officially known as BMRP 2002.4.1, discovered in the Hell Creek Formation in southern Montana. After four years of preparation, Jane was put on display at Rockford, Illinois' Burpee Museum of Natural History as the centerpiece of an exhibit called "Jane: Diary of a Dinosaur." Paleontologists who support the theory that Jane represents a juvenile believe the tyrannosaur was approximately 11 years old at its time of death, and its fully restored skeleton measured 6.5 metres (21.5 ft) long, about half as long as the largest known complete T. rex specimen, nicknamed "Sue," which measures 13 m (42.6 ft) long. The weight of the Jane specimen in life was probably nearly 680 kg (1,5