This is starting to annoy me!

[Stringerless!]

I have racing pigeons and a coon got into the coop once and just ate heads. I can't recall any stacking up carcasses though.

[Jack Peterson]

if it's a fox, there typically are just random piles of feathers left over. pretty suspicious if you ask me.

[JayinMN]

Every time a fox has gotten my poultry, chickens and ducks, there have been very little feathers. I caught one in the act of killing my ducks a few years ago. He was stacking them on the edge of the yard in the tall grass and had a pile of nine ducks. No feathers scattered about. This spring another had started on my chickens and had three laid out in a row, side by side, under some pines. If it didn't stop to eat the forth one in the middle of my yard there would not have been any noticeable feathers.