1. Those long pointy spikes on their butts arent dangerous. If they are out on dry land to have sex and they get flipped over, they use that tail spike to flip themselves back over. This keeps gulls from eating them.
2. They have 10 separate eyes all over the surface of their shells which help them see everything around them at any given time.
3. They have blue blood. This blood is also extracted by scientists and is used to treat diabetes, stomach ulcers and almost every form of cancer.
These little arthropods of the sea are cute and harmless and help save lives. Good on you, horseshoe crab.