I don't want people killing animals but if you do on accident or don't realize how wrong it is tell you do it like me. Then heres what you do. If you shoot with paintball gun or bb gun or something then make sure its dead because it might not be. So walk up to it and make sure it doesn't move if it gets up and starts going away then obviously stop there and pray for its pain to go away. Otherwise if its twitching a little take away its pain and shoot it in the head. if it is bleeding bad and looks dead then its just obviously dead. and if it doesn't have to much bleeding or anything then it might just be knocked out and in the case you would want to wait a while and try to pore some cold but not to cold water on it. and if it still doesn't move give it the finishing move to the head.
Okay after your sure its dead your going to bury a whole at least a foot deep. and then place the bird in there and put the dirt over it. your going to maybe remember that spots there with a stone or whatever. your going to want to pray for forgiveness for killing the bird and hope it didn't suffer to much.