Elasmosaurus

If youve ever experienced whiplash, you can imagine how tough a life this plesiosaur had. With a body which was mostly neck, Elasmosaurus was originally put together by paleontologists the wrong way: with a short neck and elongated tail. (It was also originally depicted as having a flexible, snakelike neck which has since been refuted.) Measuring about 46 feet (14 m), Elasmosaurus prowled the oceans at a length of nearly four Mini Coopers endtoend.