Everybody knows that birds hear much better than humans do, and a long time ago this helped the ancient Romans very much, and the wonderful hearing of the geese saved the city from attack. The Romans kept geese as domesticated animals.
In the middle of the night, an army of Goths approached the city. Although the city’s guards did not hear the sounds of the advancing enemy, the geese did, and they began to make noise.
The geese made so much noise honking, they alerted the guards in time for soldiers and citizens to make an effective defense of their city and keep it from being overrun.
During World War I, French soldiers kept parrots in high towers because of their hearing. The parrots could hear the approach of an enemy plane long before a human ear could, and they always gave warning when an aircraft was near.