Meet the Sea Slugs That Chop Off Their Heads and Grow New Bodies – The New York Times

I was really surprised and shocked to see the head moving, said Ms. Mitoh, who studies the life history traits of sea slugs. She added that she expected the slug would die quickly without a heart and other important organs. But it not only continued to live, it also regenerated the entirety of its lost body within three weeks.

via www.nytimes.com

This is a metaphor for something.