"Sarji kept carrier-pigeons"
Carrier pigeons are homing pigeons that can be used to carry messages. Homing pigeons are able to find their way home even from a very long distance away. If a message is written on lightweight paper and rolled into a small tube, it can be attached to the pigeon's leg. The bird will then carry the message back to its home.
Carrier pigeons have been used throughout history and played a vital role in delivering important intelligence during World War I and World War II.
The story of Cher Ami the Carrier Pigeon (from Home of Heroes)