When I hear that an animal can regrow its head, I think of a head in the chordate sense, as in "a hardened container of some kind with a brain and complex senso

When I hear that an animal can regrow its head, I think of a head in the chordate sense, as in "a hardened container of some kind with a brain and complex sensory organs embedded in it." Spoiler alert: the creature in this article does not have a "head" in this sense. It's a relatively simple organism which does, admittedly, have some interesting regenerative properties. Exciting title, though.