(Photo : Karolina Grabowska) Nature can be mysterious. You can find worms that do not have a butt dwelling in the deep sea, while in reef-dwelling worms that are segmented whose bodies branch like a tree starting from its head, every branch ends in a different butt. (Photo : Quang Nguyen Vinh) This species is known as Ramisyllis multicaudata, and it's likely the most mysterious worm on the planet. In 2006, It was initially discovered, and in 2012 it was formally described. Now, for the first time, experts have carried out a comprehensive study of its anatomy, finally disclosing more about this mustifying creature - and bringing up even more questions about how it lives its strange life.