The Beetle That Defends Itself With Pulses Of Heat
A Chemical Defense, Not A Flame: A small beetle facing an attacker has an unusual escape tool: a hot chemical spray released from the end of its abdomen. Bombardier beetles do not breathe fire. Their defense depends on liquid chemicals, specialized glands, and a rapid buildup of pressure. The distinction matters because dramatic descriptions can hide the biology. There is no flame, and the beetle does not burst apart. Instead, an internal reaction produces an irritating discharge. In the bombardier group called Brachinini, that discharge comes in rapid pulses rather than one uninterrupted stream.