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The Jellyfish. If these little bags of wibble don't just absolutely enthral you, I don't know what will. They have been around for at least 600 million years, have survived 5 mass extinction events and some of them are biologically immortal. I'm not sure what the other type of immortal is, presumably spiritually? I suppose it's a relief to know they won't wash up on the shores of heaven, though I'm sure St Peter would wee on you if necessary.
