My ideas would be:
That you can tell the bird for example that he should circle the ship.
That he can deliver messages by letter from ship to ship or ship to island and so on.
That you can put the bird on the shoulder.
@sleepyloli5805 Yeah if it's not a pet and is just a part of the ship that hangs out in the cage and just has NPC type interactions that trigger it to do things, that'd be fine. But it can't be ol' Polly that players have spent or would have to spend 499 Ancient Coins on.
That's a cool idea! This would be useful in alliances. Say you want to meet up somewhere, you write a message, attach it to the birds foot and send it to the other ships where it will then perch somewhere on the boat and dance around to bring attention to those onboard that there's a message for them.
So kind of like a Carrier Pigeon :D