The many-headed hydra is a real creature that regenerates itself and can live "forever"

Named after the Lernaean Hydra, a many-headed water monster of Greek and Roman mythology, the real hydra is a small fresh-water creature with incredible biological superpowers that enable it to regenerate and live 'forever.' Unlike the Lernaean Hydra, it doesn't not guard an entrance into the underworld. — Read the rest