Jellyfish are strange creatures, and they often send people in the other direction.
This is because they are gooey, mushy, and if you step on them the wrong way, painful. Jellyfish contain the power to sting someone, but other than this elementary defense mechanism, they are harmless, and in some respects beautiful, creatures. Jellyfish belong to the phylum Cnidaria, and they are invertebraes, or animals with no backbone. They contain a very simple nervous system. Their body contains a system of simple neurons that are capable of detecting food, light, warmth and vibration.