I'm not sure if I've heard those but it sounds like what I saw the other day when we were looking at some property in your neck of the woods. They would be on the ground and would take off flying very close to the ground when I approached. They'd fly ten or fifteen meters then go back into the brush. And there were a lot of them! I mean I must have startled at least eight or nine in a fairly small area, but not all at once. They wouldn't move, and I wouldn't see them, until I was maybe two meters away from them. From my description it might sound like I saw some sort of pigeon or pheasant, but it was neither of those.

I'm not sure if I've heard what you're hearing, but we do hear what I've always assumed was an owl, though I haven't heard it in a few nights. I'd really like to get a pair of binoculars because I'm constantly seeing new birds