Pigeon post

Pigeon post is the use of homing pigeons to carry messages. Pigeons were effective as messengers due to their natural homing abilities. The pigeons were transported to a destination in cages, where they would be attached with messages, then naturally the pigeon would fly back to its home where the owner could read their mail. They have been used in many places around the world. Pigeons have also been used to great effect in military situations, and are in this case referred to as war pigeon.

Question: did they really use birds to send messages
Answer: yes