Jane is a fossil specimen of a small tyrannosaurid.
It is either Nanotyrannus or a juvenile Tyrannosaurus.
The skeleton was found in the Hell Creek Formation in southern Montana in 2001.

After four years of preparation, Jane went on display at Rockford, Illinois in the Burpee Museum of Natural History.
Some paleontologists think Jane was a juvenile about 11 years old at its time of death.
Its fully restored skeleton measured 6.5 metres (21.5 ft) long, about half as long as the largest known complete T. rex specimen, which measures 13 m (42.6 ft) long.
The weight of the specimen in life was probably nearly 680 kg (1,500 lbs).
Its large feet and long legs indicate it was built for speed and could possibly run as fast as 20–30 miles per hour.
Its lower jaw has 17 curved, serrated teeth.

Despite having a typically female name, Jane's sex is unknown—the specimen was named after Burpee Museum benefactor Jane Solem.

The Jane specimen has been central to the debate regarding the validity of the proposed tyrannosaurid genus Nanotyrannus.
Jane's skull is almost identical to the skull of the original Nanotyrannus specimen, confirming that they belong to the same species.
A conference was held at the Burpee museum in 2005, during which paleontologists debated whether these "pygmy tyrants" represented adult specimens of a small species, or juvenile specimens of Tyrannosaurus rex.
While there were a few dissenters, most paleontologists at the conference decided on the latter, that both Jane and Nanotyrannus were juvenile T. rex.
However, the Jane material has yet to be properly studied and described by scientists.
This research is currently being done, by Robert Bakker and colleagues Peter Larson, and Phil Currie.
Jane is a fossil specimen of a small tyrannosaurid. It is either Nanotyrannus or a juvenile Tyrannosaurus. The skeleton was found in the Hell Creek Formation in southern Montana in 2001.
After four years of preparation, Jane went on display at Rockford, Illinois in the Burpee Museum of Natural History. Some paleontologists think Jane was a juvenile about 11 years old at its time of death. Its fully restored skeleton measured 6.5 metres (21.5 ft) long, about half as long as the largest known complete T. rex specimen, which measures 13 m (42.6 ft) long. The weight of the specimen in life was probably nearly 680 kg (1,500 lbs). Its large feet and long legs indicate it was built for speed and could possibly run as fast as 20–30 miles per hour. Its lower jaw has 17 curved, serrated teeth.
Despite having a typically female name, Jane's sex is unknown—the specimen was named after Burpee Museum benefactor Jane Solem.
The Jane specimen has been central to the debate regarding the validity of the proposed tyrannosaurid genus Nanotyrannus. Jane's skull is almost identical to the skull of the original Nanotyrannus specimen, confirming that they belong to the same species. A conference was held at the Burpee museum in 2005, during which paleontologists debated whether these "pygmy tyrants" represented adult specimens of a small species, or juvenile specimens of Tyrannosaurus rex. While there were a few dissenters, most paleontologists at the conference decided on the latter, that both Jane and Nanotyrannus were juvenile T. rex. However, the Jane material has yet to be properly studied and described by scientists. This research is currently being done, by Robert Bakker and colleagues Peter Larson, and Phil Currie.
Tyrannosaurus