You might be wondering how many different types of dinosaurs there were. This is a very good question, but one problem in answering this question is that we’re not even sure how many dinosaurs we know of! About 700 species of dinosaurs have been named, but some scientists think that we only know of about 300 for sure. Not only that, but there might be as many as 700 to 900 dinosaur groupings we haven’t even discovered yet! As much as we know about dinosaurs, there is still a whole lot left to learn. Who knows, maybe you’ll be the next person to make a really big discovery!