See following images of concept I will be adapting to cover needs for my chickens. The fenced in area around trees will be larger and with more trees and even brambles. The plants and fencing alone will not protect birds but together will really make hawks job difficult. Distance between...
Have you ever seen horse pasture with little fenced in areas around trees that provide shade? The fence keeps horses away from tree trunk and shallow roots protecting tree from damage. I will be doing similar in future to protect my cover patches from goats and sheep I will be using to manage...
You can see some of the plant types in my photo albums. Managing growth form of cover patches can be done as well. I am still doing this and intend to have a lot more cover patches that can also provide edible fruits or other ornamental value.
I free-range keep my birds with lots of hawks around. With present setup hawks are little more a source of excitement. I have several modifications relative to what you likely have and anyone helps at least a little but in combination they are very effective. Providing cover chickens can...