During World War I, France allegedly tried using parrots on the Eiffel Tower as an early warning system for enemy aircraft.
(The experiment was abandoned because the parrots were very good at raising the alarm for approaching aircraft, but were unable to distinguish friend from foe, and they quickly grew bored.)
(The experiment was abandoned because the parrots were very good at raising the alarm for approaching aircraft, but were unable to distinguish friend from foe, and they quickly grew bored.)