Bombardier Beetle: The 100°C Chemical Cannon

At exactly 100 degrees Celsius, a spray erupts from the rear of one tiny insect: the bombardier beetle. Panicked frogs have been filmed spitting them out in seconds, confused by the boiling liquid stinging their mouths. In central Africa in 1961, biologists clocked a bombardier beetle firing as many as 20 chemical blasts in under a minute. Each shot starts inside two separate chambers in the beetle’s abdomen, one loaded with hydroquinone, the other with hydrogen peroxide. When the beetle senses danger, it flexes a special muscle, forcing these chemicals to mix in a tiny reaction chamber lined with enzymes. The reaction unleashes a sudden burst of heat, shooting jets of boiling, toxic liquid at up to 6 meters per second directly into a predator’s face. But the most baffling part is how the bombardier beetle itself survives such frequent explosions-its chamber is made of cuticle lined with heat-resistant proteins, and between blasts it vents the pressure through a single tiny valve to avoid blowing itself apart. That’s how, in 2020, one laboratory bombardier beetle survived 332 chemical shots in a single hour without a scratch.