When the first British warships were sunk by German submarines during WWI, there was no method for detecting or locating a submerged submarine. So a sort of panic ensued in Britain since the accustomed mastery of the sea's surface is apparently insufficient to keep the British safe while at sea. So enthusiastically original ideas for how to locate dastardly underhanded German subarines flooded into the Admiralty.
One idea was to train large flocks of sea gulls to alight on German periscopes and defecate on the Periscope lenses
One idea was to train large flocks of sea gulls to alight on German periscopes and defecate on the Periscope lenses