There Is No Hope in Crime Alley, Night 11: Thomas and Martha Wayne are killed with a gun that shoots concentrated bats

from "There Is Hope in Crime Alley" in Batman Annual (2017 series) #5 (DC, February 2021); script by James Tynion IV; pencils, inks, and colors by James Stokoe; letters by Clayton Cowles
(Click picture to giant golden-crowned flying fox-size)