A pigeon can find its way home from wherever, so to use a pigeon as a letter carrier you first have to take a pigeon from its home on a journey with you. Later, when you need to send a letter, you can let the pigeon go and it will fly home. So using this particular pigeon you can send a letter to the place that this bird thinks of as home. If you need to send letters to a variety of places, you need to have with you pigeons from each of those places.
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