bats swarm fly. halloween mystery silhouette. black vampires swirl flight in sky. creepy flittermouse. night animals

bat fly animal flittermouse halloween swarm flight vampire swirl mystery creepy sky night flock monster creature rearmouse mammal dark wing bloodsucker gothic group evil fear scary spooky strewn devil wild wildlife predator dracula horror cave nature bite midnight october nocturnal horrific silhouette black monochrome vector element graphic isolated recent illustration