In a new study published in the Proceedings of the National Academy of Sciences, marine biologists have found that, upon amputation, the moon jellyfish (Aurelia aurita) rearranges existing body parts and recovers radial symmetry within a few days. Moon jellyfish (Aurelia aurita), Red Sea, Egypt. Image credit: Alexander Vasenin / CC BY-SA 3.0. Many marine creatures, including some jellyfish species, can regenerate tissues in response to injury, and...