The severed head of a sea slug can grow a whole new body.

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                                                                               source - https://bestlifeonline.com/random-fun-facts/
 It sounds like something out of a horror film, but it's all too real: The Elysia cf. marginata, a type of sea slug, has been found to not only survive decapitation, but to be able to grow a whole new body from it. Ecologists at Nara Women's University in Japan found that, a few hours after having their heads severed from their bodies, the snails' heads were already nibbling on algae as if nothing had happened. In about 20 days, one-third of the sea slugs studied had fully grown back their bodies—heart included.