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Are your toy dinosaurs boys or girls? One Science News editor decided her plush stegosaurus was male and named him Franklin. It was as good a guess as any since there’s really no way to tell a dinosaur’s gender just by looking at it. Even paleontologists can’t always determine gender. Female dinosaurs that were pregnant when they died had a specific type of bone tissue (and sometimes eggs inside), but dinos without that tissue could have been either males or (nonpregnant) females.