Is that dino a boy or a girl? Pregnant T. rex might help identify sexes.
Researchers have confirmed a Tyrannosaurus rex was ready to lay eggs within weeks of her death. Having a definitively female dinosaur skeleton could yield clues as to how to sex-type other specimens.
Researchers have found a Tyrannosaurus rex that was pregnant when it died some 68 million years ago – a discovery that could help paleontologists figure out how to distinguish between male and female therapod dinosaurs.
http://www.csmonitor.com/Science/201...identify-sexes