How were birds (pigeons, ravens, etc.) trained to deliver messages back in the day?
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Pigeons are pretty dumb birds but they’re very good at one specific thing – flying home.
They can sense the Earth’s magnetic field and will fly home no matter where you release them.
You just need to make sure your messenger pigeon has decided that “home” is also where your generals are located.
You can’t quickly retrain them to fly somewhere else, it’s a one-way system. Soldiers bring the birds out into the combat theater and release them to relay messages back to command.
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