Ok so I had the girls in the yard while I was doing some chores and one of these birds dive bombed several times. American Kestrel They are not large birds but he dive bombed like he meant it. Not once but several times he tried to catch the hens. Lilly was the first target. Then he went for Charger while she was less than 3 feet from me. I say he because the bird had the strong blue grey on the wings like the males in the drawings. Twice I stepped between it and a hen causing it to crash land. Hard to get 14 hens to head back into the coop or run with all the chaos going on. I had to call my son on his cell phone to help me. He hung around the area for a couple hours before a crow ran him off. Question is ..... Is this bird even large enough to take down a chicken??? He did not seem large enough but had determination. They are about a foot long.