Serpent

Fertility and rebirth
In religion, mythology, and literature, serpents and snakes represent fertility or a creative life force. As snakes shed their skin through moulting, they are symbols of rebirth, transformation, immortality, and healing. The ouroboros is a symbol of eternity and continual renewal of life.
In the Abrahamic religions, according to the Rabbinical tradition, in the Garden of Eden, the serpent represents sexual passion. In Hinduism, Kundalini is a coiled serpent, the residual power of pure desire.