Maybe a Bobcat?
Looks like there are quite a few in PA. Do you have trail cam you could set up @Duck_life ?
They have cheap ones at Walmart for 25 Bucks.
Sorry for your loss.
It seems very unlikely to me that a cat could do so much damage.Sounds more like a Fox to me and every fox attack i've had resulted only in duck casualties. Young foxes are just starting to hunt independently right now so that might of been it.