Help me heal this injured bird?

I have a cat that is a murderous little bugger, and he always brings in birds. the bird you have sounds like its been hurt quite bad and to be fair, it will probably not make it for several reasons.. 1) cat salaiva is very poisonous to birds and send them into septic shock and kills them. 2) the bird will die from shock of the whole ordeal. 3) the injury will probably get infected. because of where it is, it will carry on opening. if you do take it to the vets, they will more than likely put it down. hope i helped.