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I'm betting that the hawks don't want to dive bomb into the collection of upright posts... they prefer meadows and open spaces so that they can adjust as their prey tries to escape..
Okay, here's our theory..............A hawk CAN come straight down to grab prey. But they CANNOT go straight up, they need lift, like an airplane. (especially with prey) So our theory was if they cannot get out, they will not come in. (no animal wants to trap itself) So we blocked the flight path, so there's no where for the hawk to get lift. We did this in our orchard after we lost a hen to a hawk. It has worked beautifully for a year and a half since then.
Here's a picture when we put it in our orchard, where the 1st coop is. All the reflective tape has come down now, it doesn't hold up well to the weather. ETA: I saw the hawk fly down over the coop down the bare area (before we did this) where these posts are now.
http://i822.photobucket.com/albums/zz145/new2chooks/IMG_1360.jpg
I have friends that came home and found a hawk in their run, six pullets dead. The run was covered with shade cloth and there was a 6 inch tear in the corner that they had been meaning to fix. Yes, the hawk was trapped, but didn't seem to mind since it had plenty to snack on. Their run is also under a thick cover of oak trees. They had a hard time chasing the hawk OUT of the run!!
The flaw I see in your theory is that a hawk can easily come down, feast, and then leave. It's easier for him to catch sitting prey so worth it for him. If he doesn't get his fill he can just come back.
It's funny. My neighbor has a bunch of chickens, mostly bantams, and she's never lost a single bird in 15 yrs. of having them free range every day. We live in coyote, bobcat, mountain lion, hawk, owl, etc...territory. It amazes me.
There doesn't seem to be any rhyme or reason to it.
You have a lovely set up. The orchard makes for a beautiful setting and lots of tree coverage.
BEAUTIFUL!