My first inclination would be one of the larger mammalian predators. Just my first inclination though.
I'm open to discussion.
Owls probably wouldn't eat the whole thing.
Raccoons and oppossums are generally know for being picky eaters.
The larger mammals often take the whole bird away...
Need a little bit more information.
Was it inside or outside?
Was it in a covered run or free ranging?
Did it happen during the day or night?
What general area of the country do you live in?
If it was in protected area how big are the holes that would allow predators in?
etc.