The Ouroboros is an ancient symbol depicting a serpent or dragon swallowing its own tail and forming a circle. It is one of the oldest mystical symbols in the world. The serpent or dragon appears in Aztec, Middle East, and Native American mythologies, among others. (from Wikipedia)
xenmate at a near life experience has discovered the REAL ouroboros:
This is an Armadillo Lizard, which, if frightened, will grab its tail in its mouth and roll into a ball.
Look how cute and little they are: