In the olden times, how did a raven or a carrier pidgin know exactly where to deliver letters?
Hi, using ravens for message delivery is an invention of Game of Thrones, but carrier/homing pigeons were and still are a real thing. You may find these posts interesting:
How frequent do pigeons (or other birds) get used to deliver messages during the ancient to medieval era? - in which /u/Cenodoxus takes a look at the suitability of ravens, falcons, and pigeons
How common was the use of birds to carry messages during the middle ages? - in which /u/Celebreth talks about pigeons through history, including training
How effective and reliable were pigeons as means of communication in WWI? Is it possible to estimate how much was lost/miscommunicated in their use? How were they trained? - in which /u/mikedash discusses the use of pigeons during WWI
edit: I just noticed that /u/Cenodoxus mentions anti-pigeon warfare - you may find this interesting