Who would win in this fight? 20 duck size horses v 1 horse sized duck?
Even if the Mini-Horses were good team players I Imagine a few pecks from a huge duck bill would cause numerous casualties and demoralize the ducks, leading to a retreat. Of course the duck could fly in pursuit and might catch a few cowardly mini-horses, but i think at least three or four would live to tell the tale, presuming they didn’t all run away in the same direction.