I have the fake owl up, there's some crows in the area but a BYC'er had mentioned that Swallows, when they have babies, really help to keep hawks away. We recently decided that we will soon(hopefully!) start the process of moving the ducks to a different pasture and building their new coops there. I want to hawk proof it as much as possible because that pasture is closer to the trees. The owl will move, we'll still ahve the crows and the pens will be done up as well as we can to keep hawks away but i am going to put up quite a few bird houses for the swallows. We have a lot in the area but it'd be great if they nested near the ducks, especially if they will help to keep the hawks away some. So are these kinds of bird houses good for swallows? I have to go dig out a bigger hole drill/saw because the one i have now is only 1" and it seems small for the entrance. I still have to get some dowel pieces for the big one, but so far i have been lucky enough to have all the wood i need laying around here.