The Bakunawa is a legendary one-horned dragon from Philippine myth. It's said that it causes eclipses when it attempts to swallow the moon.
The Egyptian Oroboros, later popularized as an alchemical motif, is famous for biting down on the tip of its tail-creating a magical loop.
The Serpent in the Garden of Eden, which tempted Adam and Eve to eat the Forbidden Fruit of Knowledge, is sometimes compared to a worm.