100 오리 sized horses, probably. I doubt the horse sized 오리 will be able to fly anyhow, so I think that'd be a huge liability.
Is this just a coincidence that a few days ago, I read a post on iwsmt about horse-sized ducks?->
link Apparently we had used to have horse sized ducks here a couple ten thousand years ago.
They actually looked like this though:
link (Scroll down on the iwsmt post to see the comment.)