And oddly enough, there were two dinosaur groups, as theropods are said to branch off the OTHER major group of dinosaurs from sauropods. What are ornithischians, crocodylomorphs? ;). Sadly missing rebuttal commentary like, "oviraptorids didn't nest, they were accidentally placed atop their eggs since lizards don't nest-sit or brood," or "no dinosaur has feathers, their smooth skin has collagen fibers that show they had thick, rubbery skin like dolphins!" and other such fascinating tidbits!