system
Given the following post, respond as if you're commenting on Reddit:
human
How do "homing pigeons" know where to fly?
gpt
In addition to the other comment, sending a message via pigeon is a one-way communication.  The pigeon will only fly home, it won't fly back or anywhere else.  If you wanted to reply to a message received by pigeon with another messenger pigeon, you would have to already have a pigeon on hand for the location you received the message from.