So sorry for your loss.
GRAPHIC ANSWER BELOW...
Sounds brutal. Sorry to sound insensitive, but where was the skin? And the feathers? I once had a raccoon pull an entire rabbit through a one-inch opening and skin it. Just awful. A raccoon can easily reach an arm in through small openings. Is that a possibility? Also, weasels can fit through small openi ga and do serious damage. Can you post photos of your set up? Maybe we can help you find where the security breach is.
GRAPHIC ANSWER BELOW...
Sounds brutal. Sorry to sound insensitive, but where was the skin? And the feathers? I once had a raccoon pull an entire rabbit through a one-inch opening and skin it. Just awful. A raccoon can easily reach an arm in through small openings. Is that a possibility? Also, weasels can fit through small openi ga and do serious damage. Can you post photos of your set up? Maybe we can help you find where the security breach is.