RE: Birds can navigate by using the Earth’s magnetic field, and scientists have recently discovered a protein in the eye that is likely responsible for this ability

[valth]

I don't have any personal experience with homing pigeons, but from what I understand, they cannot really be sent off to an unknown location. What you do is teach a homing pigeon where its home is, then transport it to another location. Now give it a letter, release it, and it will fly home. So if we're talking about postbirds in the medieval times, you would need one pigeon for each city you wanted to send a letter to.

Comments

[event-horizon]

Okay, that makes some sense.
What do you think about cats? Do they also navigate like pigeons do? Because cats never forget their home too, doesn't matter how many miles far they go.