Bacunawa is a mythical creature from Filipino folklore, often depicted as a large serpent or dragon that is said to cause lunar eclipses by swallowing the moon. In various legends, it is portrayed as a fearsome being that seeks to consume celestial bodies, resulting in darkness during these events. The Bacunawa is often associated with themes of nature and the cosmos, and stories about it vary across different regions in the Philippines. In some tales, it is also seen as a symbol of the balance between light and darkness.