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Through the years of searching for fossils of the ever-popular Tyrannosaurus rex, locating a pregnant one has been understandably difficult.
But scientists now believe they've located one, determining this particular T. rex that roamed Montana was female.
Traditionally, it's been extraordinarily difficult to figure out a dinosaur fossil's gender.
Specifically, the researchers from North Carolina State University and the North Carolina Museum of Natural Sciences found a medullary bone in a T. rex femur.
This T. rex isn't the first known example of a pregnant dinosaur. Fossils of both Allosaurus (a Jurassic-period, meat-eating relative of T. rex) and Tenontosaurus (a herbivorous relative of the duck-billed dinosaur) have been found with medullary bone, suggesting that the individuals may have died just before, during or after laying eggs