Examples of hadrosaur vertebrae with healing fractures suggest an external force pressed on top of them. Filippo Bertozzo/iScience

Paleontologists have long wrestled with how to differentiate between male and female dinosaurs based on their fossils.

But new research may bring scientists closer to identifying the sex of one group of dinosaur.

Hadrosaurs, also known as duck-dilled dinosaurs, were common during the Late Cretaceous Period (100.5 to 66 million years ago), and the bones of these herbivores have been found across multiple continents.

Some hadrosaur fossils show evidence of healing from traumatic bone injuries, all in the same location: on their vertebrae past the base of the tail.

No soft tissues preserving evidence of dinosaur reproductive organs have been found in the fo

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