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Jane

Jane: Diary of a Dinosaur

A Young Tyrannosaurus rex...
After years of preparation, Jane, the world’s most complete and best preserved juvenile T. rex, is on display as the centerpiece of a captivating exhibit at Burpee Museum, Jane: Diary of a Dinosaur. Come discover what happened during the 66 million years she lay buried, and view Jane’s fully restored 21-foot skeleton.
Jane: The Most Complete Juvenile T. rex

Before Jane, there was a critical gap between juvenile and adult T. rex dinosaur specimens, and it was unclear how their body structures changed over time, said study lead researcher Thomas Carr, an associate professor of biology at Carthage College in Wisconsin.

"Jane is simply the best preserved and most complete example of a publicly accessible, subadult Tyrannosaurus rex in the world," study co-author Scott Williams, and former director of science and exhibits at the Burpee Museum, said in a statement. "The quality of the specimen and its availability will undoubtedly provide researchers decades of important data regarding the ontogeny [aging process] of the most recognized dinosaur species in the world."

 

A paleontology field crew from the Burpee Museum discovered Jane in Ekalaka, Montana, in 2001. They noticed her bones poking out of the rock of the Hell Creek Formation, and quickly got to work excavating the remains of the half-grown, 20-foot-long (6 meters) T. rex.

However, Jane isn't the first "little" T. rex specimen on record. In 1942, scientists found a small and lightly built tyrannosaur skull near Ekalaka. The finding sparked a debate about how much T. rex changed as it grew from infancy to adulthood. The skull sat for about 50 years on display in the Cleveland Museum of Natural History, but triggered another controversy in 1988, when famed paleontologist Robert Bakker analyzed it and announced that it wasn't a T. rex, but a newfound species.

Bakker called the new species Nanotyrannus lancensis and proposed that it was a smaller and sleeker cousin of T. rex.

 

In 1999, Carr suggested that Nanotyrannus wasn't a separate species, but in fact a juvenile T. rex. Many paleontologists were doubtful of this hypothesis, unsure that a dinosaur could change so drastically as it grew older, the researchers on the new study said.

"The extreme changes from the sleek skull of juveniles to the robust skull of adults were too much for some people to believe," Carr said. "For example, they didn't like to hear that T. rex lost tooth positions as it grew from a juvenile with many teeth, to an adult with fewer teeth. Regardless, the search was on for a transitional specimen that could test the hypothesis."

Jane may help clear up that confusion. Her slender skull and skeleton are intermediate in size and shape between the Cleveland skull and other adult T. rex skulls.

"Jane shows us that the gap is, in fact, bridgeable because many features seen in her are more similar to adult T. rex than to the Cleveland skull," Carr said. "The features are exactly what we'd predict are necessary to make the change to a full adult."

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