Why is Persephone's sacred animal a bat?

One Persephone's many symbols is the bat because she was abducted by Hades (king of the underworld) as a young innocent maiden and became his consort and err go Queen of the underworld. The bat symbolizes her ascension from light to dark/day to night/purity to corruption as well as her entrapment within a world of darkness Hades brought her into .. etc..... You get the point. =^.^=