What did rats do in World War 2?

Military animal

Dead rats were prepared for use by the British Special Operations Executive in World War II against Germany. Rat carcasses were filled with plastic explosives, to be left in locations such as factories where, it was hoped, the stoker tending a boiler would likely dispose of the unpleasant discovery by shoveling it into the furnace, causing it to explode. The rats contained only a small amount of explosive; however, a puncture of a high-pressure boiler could trigger a devastating Boiler explosion.

• Animal carcasses have been used to camouflage roadside Improvised explosive devices during the Iraqi insurgency.