Suicidal chickens

We had four chickens on Thursday. On Friday we only had three. Our neighbor said he has seen a chickenhawk around and we found feathers so we don't expect to see this chicken again. So we've been on the lookout for the hawk. And this morning I heard the flapping of large wings outside my window. I immediately looked out and saw three nervous looking chickens, all tensely poised to run, and all standing completely in the open. Nearby was a tree and a coop, both much safer places to avoid a chickenhawk. But the chickens remained in the most dangerous possible place they could, worrying about the chickenhawk.