About 68 million years ago, a pregnant Tyrannosaurus rex died in ancient Montana. The finding is an exciting one — researchers verified that the T. rex was pregnant by looking at the organic components in the dinosaur's bone structure, elements that had survived for tens of millions of years since the predator's death, said study lead researcher Mary Schweitzer, an evolutionary biologist at North Carolina State University. "We need to quit selling fossils short," Schweitzer told Live Science.
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