Where is the hawk squeezing in?
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If you have not roosters, then maybe get a game cock.
Hen only flocks, in my experience, are more likely to face losses. If that is a Red-tailed Hawk, then I would pen the chickens up for a few days regardless.
The coop had a door I can walk through/I really hate that; but it proves my point you can do ALL you can possibly do and hawks don't seem to care, they'll risk injury even it seems for an "easy free meal" of chicken.
No they can get through it by just crashing through it or they fly sideways shaping like a rocket to get through smaller areas. We ended up putting fishing line and bird netting. Unfortunately if there’s a will there’s a way. So far with the extra netting nothing has been eaten, but hawks get hungry too.It depends on how your chickens are kept while outside. If they free range, there should be lots of cover for them to run under when they see/sense a hawk is around. Chickens learn to worry about shadows up above them and one usually sounds an alarm, unfortunately it takes a little while for them to learn sometimes. I'm sorry you lost some of your birds.
If they are in a run, it's easier that's for sure. you can criss-cross the top with monofilament line (heavy duty fishing line) and hang CDs around on it. Hawks can't manuver through the line well, and they don't like the spinny reflective light off of the CDs.
If they free range, you can still hang CDs around the yard. I started searching for some of the pictures here, maybe someone else will post the links too, there's a BUNCH of examples of how people have done this.
None of this is perfect, hawks are a danger and you're right, they are totally protected by federal law so it's a good thing you stopped your brother. All migratory birds are and that includes all hawks and eagles even though they don't always migrate. The good thing is, this red-tail may be on his way to another winter grounds and he will be on his way soon.
I'll search for hawk deterrents more too.