Just as a general rule, it is usually a Coopers Hawk, but not always..... a Coopers hawk will not be deterred by trees. They hunt in woodland habitat. It might not want to take on a larger chicken. But there are some that do, quite efficiently. But you can throw them off. They are for the most part extremely wary, although some describe hawks that they could reach out and hit with a stick. Just being around will discourage them. Not letting them out early. Keep th chickens hungry for a treat so you can get them to go back in when you need them to. I let mine out a little later generally but hawks can attack at any time of day. Roosters are helpful but they are edible to hawks also.
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