Cher Ami was a male homing pigeon who had been donated by the pigeon fanciers of Britain for use by the U.S. Army Signal Corps in France during World War I and had been trained by American pigeoners. He is famous for delivering a message from an encircled battalion despite serious injuries during the Meuse-Argonne offensive in October 1918.

The homing pigeon, also called the mail pigeon or messenger pigeon, is a variety of domestic pigeons derived from the wild rock dove, selectively bred for its ability to find its way home over extremely long distances. The rock dove has an innate homing ability, meaning that it will generally return to its nest using magnetoreception. Flights as long as 1,800 km have been recorded by birds in competitive pigeon racing. Their average flying speed over moderate 965 km distances is around 97 km/h and speeds of up to 160 km/h have been observed in top racers for short distances.