Fossil analysis shows that pregnant theropod dinosaurs, like the T. rex on the right, apparently developed medullary bone as do modern-day female birds.

Researchers discover pregnancy test for T. rex

A pregnant Tyrannosaurus rex that roamed Montana 68 million years ago may be the key to discerning gender differences between theropod, or meat-eating, dinosaur species. Researchers from North Carolina State University, the North Carolina Museum of Natural Sciences and DMU …

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