A Black Leather.bird mask. Why is it scary? It certainly looks creepy, and not without reason. During the Black Plague, Italian doctors wore these to keep from inhaling airborne contaminants. Bubonic plague had a sister virus called pneumonic plague, which was airborne, and therefore twice as deadly. In those days they didn't know viruses worked, but they understood contagion! Black Plague Mask, Plague Doctor Costume, Plague Mask, Plague Doctor Mask, Doctor Mask, Beak Mask, Steampunk Mask, Doctor Costume, Steam Punk