The US once tried to firebomb Japan with bats. The surreal plan was the brainchild of an American dentist, who had enough sway on Eleanor Roosevelt to get his plan trialled by the US.
The bat-bomb would explode mid-air. It would scatter dozens of bats, each individually packed, and tied to a small incendiary charge on a timer. The idea was that the bats would scatter to roost in the wooden rafters of Japanese buildings. After a while the charge would alight itself, and the building would burn down — bat and all.
The concept, which gloried in the name of Project X-Ray, was abandoned after some test bats got loose and burned down an Air Force hangar.