The bat is a night flyer. Avoiding daylight, he retreats each morning to a dark cave where he hangs upside down, gathering energy for his nighttime escapades. He is a blood sucker whose bite spreads pestilence
Nichols reads the bat’s behavioral traits — nocturnality, inversion, parasitism — as precise symbolic correspondences for the Devil archetype’s relationship to the unconscious and the shadow.
, Jung and Tarot: An Archetypal Journey, 1980thesis