As new studies and discoveries are made, dinosaurs are becoming so much different from the way we always imagined them that, today, many of us have trouble recognizing even our childhood favorites. I give you ten classic dinosaurs that have changed radically due to new paleontological discoveries. And they may still change a lot in the future! Note: each entry has two images - the first is the previous image of the dinosaur, and the second is the new. Dinosaur before and after shots!