Bakunawa

The Bakunawa, also called the Philippine moon-eating dragon, the Philippine moon dragon, moon dragon, or the moon-eating dragon, is a dragon-like serpent in Philippine mythology that causes several natural phenomena, primarily eclipses. The movements of the Bakunawa served as a geomantic calendar system for ancient Filipinos and were part of the rituals of the babaylan priestess. It is usually depicted with a characteristic looped tail and a single horn on the nose. It was believed to inhabit either the sky or the underworld.