This is a question with answer options. Goal: What is an ancient method used for long distance communication?

Which of the following methods is more reasonable for accomplishing this goal?

Choose from:
[+] People tied scrolls with messages on to pigeons' feet and let them carry the message.
[+] People tied scrolls with messages on to leopards' feet and let them carry the message....I think the answer is
People tied scrolls with messages on to pigeons' feet and let them carry the message.