I also feed the birds, and love watching them at my feeder.
I once watched a Kestrel swoop in and take a Finch. At first I was upset, but also realized that it was the "Laws of Nature" at work. I only saw it once, and that was enough, and I still feed the birds.
I live near a reservoir and can see the Hawks scouting for their next meal. However, my favorite sites have been the Bald Eagles out on the ice in the winter wondering how to "go fishing". Or the one I saw swoop down into the water in the summer and comeout with a fish in its talons.
Beautiful photos and beautiful birds.
Susan