The Bakunawa is a serpent-like dragon in Philippine mythology. It is believed to be the cause of eclipses, earthquakes, rains, and wind.[1] 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 generally believed to be a sea serpent,[2] but is also variously believed to inhabit either the sky or the underworld.[3] Due to increasing trade contacts with South Asia and the Indianization of Southeast Asia, the Bakunawa later became syncretized with the Nāga, Rahu, and Ketu of Hindu-Buddhist mythology.[2][4]