5. Amargasaurus
Those of you who have seen Jurassic Park probably remember the awe-inspiring size (and sneeze) of the Brachiosaurus. Sauropods were the real giants of the dinosaurs, with the largest being Supersaurus (33-34 meters). So, how do you take a giant among giants, and make it both weirder and cooler? By fusing it with a stegosaur, of course!
Amargasaurus was a relatively small (9-10 meter long) sauropod found in modern-day Argentina. Stature aside, the thing that stands out most are two parallel rows of spikes, or perhaps a sail, running all the way down its neck. Given this herbivore’s relatively small size, it’s possible that these spikes were used for defense. They could also have been used for auditory signaling, a mating display, or thermoregulation. Biting into this long neck would be like trying to eat a porcupine!