Probably the most innovative concept for incinerating Japan was the Bat Bomb.Lytle Adams, a Pennsylvania Dentist, had been impressed with bats he saw in New Mexico caverns and wrote to President Roosevelt in January 1942. Since bats can carry more than their own weight, Dr.Adams opined that small incendiary devices could be attached to hoards of the flying rodents, which, when released in cluster bombs over Japanese cities, would roost in rafters until the weapons ignited. Though promising, the project was cancelled when some armed bats escaped at an Army airfield in New Mexico and burned the test facility to the ground.
*exerpt from Whirlwind: The Air War Against Japan, 1942-1945 By Barrett Tillman