BBC Radio tells the fascinating story of the U.S. WWII Project X-Ray which planned to use bats armed with explosives to attack Japan. External Link: BBC Radio.

The History Net website has an article on both the U.S. bird and bat bomber projects from Aviation History magazine. This article covers two unrelated projects which sought to use pigeons and bats to aid the Allied bombing campaign. External Link: Top Secret WWII Bat and Bird Bomber Program.