We had ducks and geese when I was a teenager and two of our geese had a fight over our female mallard....they literally grabbed hold of her, one each side, and pulled. They split her chest clean open....you could actually see her heart beating and she was laked in blood!!! We rushed her to the vet, expecting them to say that euthanasia was the only answer and instead, the vet squirted a bunch of antiseptic powder into the wound, pulled her skin together, almost like closing a jacket, popped a single staple in the middle to hold it together and told us to take her home and restrict her movement. We kept her in a cardboard box for a week, her head stuck out a hole in one end and her butt out the other, hand fed and watered her, cleaned her butt and a week later, the wound had knitted and a couple of weeks after that, you'd never have known it had happened!!! It's truly amazing what they can get through with the right treatment!