I've already lost two hens to hawks being very bold and somehow getting in the run but that was in spring/late winter before the leaves filled in and now I have my girls under a full low canopy of maple tree leaves. I do plan to add a netting cover but I'm just wondering if I could get away with it before I do that. THe poor girls do not like being cooped up in a coop haha. I just don't see how a hawk could see them but I don't put anything past them either!