I once found a duck in our yard hobbling around disoriented. Then I saw a bit of blood on its head. We caught it and noticed it must have been hit by a car. skull was cracked and it was bleeding pretty well. We took it in but I can only imagine that they ended up putting it down.
As far as the raven, if the worst of its injuries are a broken wing I'd think the worst they would do is amputate it and a bird rehabilitator could take it in and care for it. I knew a bird rehaber a while back who took in a raven with a broken wing. great bird.