I had a pen of chicks out last week in a make shift run. I had chicken wired all around it, over the top of it, but there was one small opening from the dog crate that the chicks were in. I just put the crate at the run opening and opened the door so they could play in the dirt, but have their kennel for protection. Imagine my surprise when I went to check on them, and a hawk had somehow, someway, gottin thru that small opening, and killed a chick. He couldnt figure out how to get back out. Geez, he was gorgeous!! I still havent figured out what kind he was, he was a slate blue. I opened up the opening more so he could figure his way out. I secured the run better, and he hasnt taken any more.
We have a LOT of hawks around here. But my yard is also just full of bluebirds, cardinals, gold finches. I think theres plenty of food for the raptors here. Its nothing to see bald eagles floating over my house. I havent lost a full grown chicken to any (yet), but I try and protect them the best I can.