I was told to move the question to this forum. I let my flock of 5 adult ducks out this morning as I do every day. When I got home around 4pm (before dark) I found my duck brownie dead cold and stiff with his head detached and laying there about 2 feet away, in a big messy pile of his small feathers. About 6 feet away I found a couple more of his feathers, but only larger ones. His broodmate, Daisy, lost a few feathers and had a bloody bill, and is freaked out, but otherwise seems okay.
What predator does this??? It must have happened in full daylight, at least an hour or two before dusk. The head was torn off, feathers everywhere, but the body was otherwise intact... nothing else was missing and the rest of the body was not torn. Whatever it was, it attacked the other duck too.
Daytime predators as far as I know are mostly dogs, cats, coyotes, and hawks... but none of those three fit the details... thanks for your help guys
edit: I'm in eastern PA area