Answer:
The central idea of this passage is that homing pigeons have been a reliable source of message delivery for thousands of years. The passage mentions that homing pigeons have been used by the Egyptians dating back to 3,000 BCE, and their use continued through the centuries. It also highlights their role in World Wars I and II, where they were considered heroic for delivering important messages between battlefields. The passage demonstrates the historical significance and reliability of homing pigeons as a form of communication.