Okay, I’m not sure if the bird is still with us. I’m so sorry. I know you’ve heard a lot, and done your best already. I just wanted to say, do not try and stitch, bird skin is so thin you will tear and create more injuries and pain. If you need to close you can actually use a super thin coat of super glue on the outermost layer of skin. I would not do that here because with a wound this size you would need to add a drain and I don’t think anyone’s up to that right now. It honestly looks like internal organs are exposed right now, so I would clean with either a saline mix, because that is actually a very natural thing, or I would flush with an antibiotic. You need to get some pain meds into that duck, even if she has survived the initial shock there’s a possibility that pain can take her out later. Look what you have on hand, and what ducks can take. Don’t give her actual food right now. I know she’s hungry but with her inside being outside at most she can get a slurry. Which is water mixed with food so it’s a liquid. Having nothing on hand can really suck! You can use plain old Vaseline or news wax to coat her wound. If possible I would slather her up with Manuka honey in they wound. Expensive, but effective. If you have literally nothing on hand, paper towels covered in Vaseline or damp washcloth can apply pressure to the wound without sticking to the clots. I know you put your duck in the bath, it seems logical, but it will actually break clots and introduce bacteria you don’t want there, so keep her out of the bath until she’s healed, and putting her in there to get warm wasn’t a bad idea just avoid it in the future. Now, if you have less than nothing on hand, are there cattails in your yard? Birches anywhere around? Goldenseal? Witch hazel? Aloe Vera? Coating a wound in aloe Vera juice has produced marvelous results. Amaranth helps stop bleeding, but it can be hard to find. Back to cattails, they are your best friend. The sappy stuff in between the bottom leaves can help stop bleeding, it’s antibacterial, and it’s a great pain reliever, as well as a little anti inflammatory. Boil the leaves, and you have an antiseptic flush. Add cattailpollen to honey and cover any small wounds or puncture wounds. When I said if you have nothing, I meant if you have nothing. Birch bark tea is analgesic, witch hazel is soothing and antiseptic, goldenseal isn’t my favorite, but if it’s what you got it’s antiseptic, make a tea with it and flush the wound. Cattails and aloe Vera would be my top two picks though. So sorry about your duck.