Just tweet them nicely and it will beak-come clear ... :)
If you have to, I think you may want to talk to a shrink.
Bird, bird, bird, bird is the word. Has anyone heard about the bird? ... Isn't that what that song is all about? Or, middle fingers?
I don't negotiate with birds, they're @ssholes.
You must sit them down, make sure you have their attention, then give them the facts of life, demonstrating the size difference difficulties.