That is, until paleontologist Mary Schweitzer found a definitive way of identifying the bones of a female dinosaur, after being dead for millions of years. She discovered medullary bone in the ...

Whether it’s a bird or a dinosaur, it starts scraping to show its mate, ‘I know how to build a nest.’” He added that “in the excitement, it makes a few scrapes, and that’s enough for that one, and ...