In many cultures and belief systems, crows are often associated with death, mystery, and the supernatural. In the context of the question regarding the significance of the crow in the movie "Demon," the crow could symbolize a harbinger of doom, a connection to the spirit world, or a representation of darkness and evil within the storyline. The crow's presence may add an element of foreboding or foreshadowing to the narrative, creating an atmosphere of tension and unease for the characters and audience.