Ant acid

The oogpister beetle has a novel way of detering potential predators. After feeding on a diet of ants the beetle appears to extract the formic acid they produce for their defence and use it for himself. When threatened, the beetle can spray a small jet of this formic acid straight into the eyes and nose of its attacker. The beetle's distinctive black and white markings act as a warning signal to possible predators and once sprayed they learn not to attempt to eat this beetle. It's a set of markings worth imitating, so a harmless lizard can gain a lot of protection, by simply looking the same as the beetle.