5. Reproduction
We know that dinosaurs were relatives of reptiles, and modern day reptiles have a single opening for urination, defecation, and reproduction. It’s believed that dinosaurs were no different, making through the touching of openings called “cloaca”, which is Latin for sewer. Not the best name, but they do refer to this action as a “cloaca kiss”, which does make it a bit better. However, some dinosaurs like the T. Rex is believed to have sex organs similar to humans, some even reaching over 12 feet in length. All built nests to lay their eggs and some even nurtured their babies into young adulthood.