Go get some live traps off the internet and catch the strays then take them to the animal shelter or a farm near you that will take the cats for controlling pests. You would be surprised how many farms have serious pest problems and need a few cats
There might be some stray cats or dogs around, usually when the bodies are really torn up it would be the result of a dog shaking the bird by the head. Keep an eye out for any stray dogs or cats or other preadators, you could try to get a live trap and see what you can trap. If they are eating...