Okay I’ve already got stories rolling around in my head on this one. I just hope we don’t have the same ideas, because you’re likely to write it faster than I am!
The hydra’s got kind of a jellyfish thing going on, with tentacles it uses to snag prey. But it can live a really, really long time.
Source: Absurd Creatures: Hail Hydra, the Incredible, Maybe-Immortal Animal | WIRED