Yesterday, I had a bald eagle swoop down and grab one of the young cochins that was right behind me. He flew right next to me, so close I could have grabbed him. My dog was barking at him and chasing him. That may explain a couple missing ducks. I've never had an issue with eagles. This is upsetting.
They're usually opportunists and scavengers - they'd rather pick up a dead fish than actually fish for it most days. He/she may have run out of road kill.