Spinosaurus was the main villain of Jurassic Park III because...well, look at this terrifying beast! It's the biggest meat-eating dinosaur ever found, much larger than T-Rex. What makes this enormous carnivore even more intimidating is its freaky appearance: a crocodilian head, dextrous arms, and a dramatic sail that serves no obvious purpose except to say, "Enjoy the view, it's going to be your last!"