[Lawtan]

Oh yeah, the microscopic Hydra are possibly biologically immortal...as are certain vine-like trees and a jellyfish species that is actually beginning to overpopulate the ocean. I think they are also both sexes. (Correction: they normally reproduce asexually, but can grow the needed organs when under stress and diversity is needed...like if a disease was killing them off)

>.> Several of those characters are from an Early Middle Ages/Late Antiquity setting on an Animorph style world...sort of created from an RP or two falling through, my general interest in Archaeology/folklore/creatures, and from a pair of characters I sort of linked in my head.