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2. Pigeon-hole messagebox - Wikipedia

   en.wikipedia.org/wiki/Pigeon-hole_messagebox

   Pigeon-hole message boxes are also used in research institutions, libraries, and archives to provide researchers with secure access to archival records, rare books, and other unique material that cannot be removed from the premises. In large organisations the mailboy delivers mail to departmental pigeon holes from the postroom (UK) or mailroom ...

3. Pigeon post - Wikipedia

   en.wikipedia.org/wiki/Pigeon_post

   Pigeon post is the use of homing pigeons to carry messages. Pigeons are effective as messengers due to their natural homing abilities. The pigeons are transported to a destination in cages, where they are attached with messages, then the pigeon naturally flies back to its home where the recipient could read the message.

4. Pigeonhole principle - Wikipedia

   en.wikipedia.org/wiki/Pigeonhole_principle

   Pigeon-hole messageboxes at Stanford University. Dirichlet published his works in both French and German, using either the German Schubfach or the French tiroir.The strict original meaning of these terms corresponds to the English drawer, that is, an open-topped box that can be slid in and out of the cabinet that contains it.

5. Homing pigeon - Wikipedia

   en.wikipedia.org/wiki/Homing_pigeon

   A messenger pigeon on a house roof A group of homing pigeons in flight A modern day racing pigeon wearing an electronic timing ring. The homing pigeon is a variety of domestic pigeon (Columba livia domestica), selectively bred for its ability to find its way home over extremely long distances.

6. Mail delivery by animal - Wikipedia

   en.wikipedia.org/wiki/Mail_delivery_by_animal

   Homing pigeons have been used to deliver small messages since the time of the Persians. Mail delivery by animals has been used in many countries throughout history. It used to be the only way to quickly transport large bundles of letters over long distances, until motorised vehicles became more widespread. Mail is still delivered by animals in ...

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