25 mar. 2016

Tyrannosaurus Rex Confirmed to have been Pregnant

One of the frustrating aspects that paleontologists face when studying dinosaur fossils is the odd lack of sexual dimorphism in the ancient creatures -- being able to tell the difference between male and female individuals based on their physical features. However, one method of telling whether an individual specimen is a female or not has been uncovered, with the confirmation of a Tyrannosaurus rex fossil that came from a pregnant female.

"This analysis allows us to determine the gender of this fossil, and gives us a window into the evolution of egg laying in modern birds," says the study's lead researcher, North Carolina State University evolutionary biologist Mary Schweitzer.

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