[kach22i]

https://www.rpra.org/pigeon-history/pigeons-in-war/

All RAF bombers and reconnaissance aircraft carried pigeons in special watertight baskets and containers and, if the aircraft had to ditch, the plane’s co-ordinates were sent back with the pigeon to its RAF base and a search and rescue operation was effected. Thousands of servicemen’s lives were saved by these heroic birds that flew often in extreme circumstances.