There is however the potential that the player can in fact fly as fast as a pigeon, or use magic to either track the pigeon or to fly themselves; or read the actual message on the pigeons foot.
As I said, "precisely the sort of travel abilities that would make messenger pigeons obsolete." Whatever magical abilities that your Adventurer has, it's a fair bet that any good-sized settlement that you visit is already going to boast a local with comparable powers--meaning they don't need
you. A world where magic is the answer to
everything might not be much fun to play.
Could we consider other animals to do this?
There's at least one
previous thread that mentioned the pros & cons of other animal types, including bats, ravens, owls, cats, rats, dogs, wolves, penguins, reindeer, sharks, hawks, crocodiles, etc.
Seahorses are a no-go: They're very weak swimmers that can't defend themselves, are too small to carry much of a message, and I don't think they even migrate. A good messenger creature is:
- Intelligent (enough to not get lost)
- Homesick (from a species with known navigational abilities that can be turned into homing tendencies)
- Fast (gets the news there quickly)
- Versatile (can traverse a wide variety of types of terrain)
- A predator, or otherwise able to fend off threats along the way
- Comfortable acting on their own (not a member of a species that always stays in large groups)
- Monogamous (being part of a mated pair increases the desire to return to their mate)