Do you know what a jellyfish's number one defense against predators happens to be? They don't really taste that great! Jellyfish are made mostly of water and so they don't have a really appealing taste. Aquarium.org is a great site to find interesting jellyfish information that is accompanied with some really great illustrations that help everything make sense! The topics outlined on this site include the jellyfishes physical characteristics, life cycle, and closest relatives.