Jellyfish are really interesting animals, and a key point in evolutionary natural history for Deep-sea inverts. They have some amazing reproductive and defense mechanisms that make them some of earths most enthralling, and sometimes peculiar species in our oceans, and fortunately many zoos hold a plethora of species, often inspiring aw in them like myself, when I first saw moon jellies when I was younger. Though they might be painted as dangers of the sea, they still are remarkable acting, and some of them being quite Extravagant and beautiful looking as well. So like So many threads before this, Like O.C's Favorite parrot species, what are your favorites? These can be favorites because of viewing them in captivity, reading about them in a book, or seeing them in the wild. Beauty, biology, and anything else can both be factors for favorites here, but regardless, Leave your thoughts below! I'm sure more threads from other people will expand upon this top 5 formula.