Now, now do you really beleive everything you read? And do you think that an old drake wouldn't back down from a shovel or booted foot. My drake is afraid of his own shadow and his hens and the roosters. And Ray. He runs the other way when Ray yells "get off the deck"....doesn't even have to move toward him. Now he is young, but if he tries anything he is just a bird, without a beak for that matter, and I will knock some sense into him. But for now he is a very respectful, to large to fly up and hurt me, duck.
And as far as roosting in trees, mine don't even roost on the rail of my deck or the chicken roosts, much less a tree. They sleep on the floor of the coop or the top of the table in the coop.
I got them to eat the flies. They are supposed to like flies. I guess if they don't like flies then I guess I won't hatch any more of them....but they are good foragers. So soon my feed bill will go down.
If they also eat mice and voles THAT would be a wonderful bonus.