Promecognathus laevissimus is one of two beetle species that constitute the genus Promecognathus, which can shrug off a knockout blast of cyanide gas, the go-to defensive weapon deployed by many flat-backed millipedes (Polydesmida) against predators. Researchers have found that the beetles, which specialize in targeting millipedes, do not use avoidance behavior or any other observable countermeasures, but survive the gas attack because of a high tolerance to cyanide. (Photo courtesy of Brandt Weary)