“As far as we can tell, it doesn’t age or die,” says Assistant Professor Celina Juliano, Department of Molecular and Cellular Biology. “You can cut little pieces out of the animal and it will regrow and maybe the most amazing thing is that you can dissociate the animal into single cells, mix them all up, put them back in a ball and a new Hydra will just grow out of it.”

biology.ucdavis.edu/research/model-organisms/hydra

en.wikipedia.org/wiki/Hydra_(comics)