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“The real survivor is indeed a cephalopd, but nautilus rather than octopus.Still living in the Pacific, present-day nautiluses are little changed from 200 million years ago. Living in coiled shells,they‘re now scavengers.They have simple eyes and a cluster of tentacles,and they move up and down, from the deep sea to shallower water in a rhythm that‘s still being studied.They seem to stay higher in the water at night, deeper in the day.”