Looks like that cat has been through some serious $hit.
I would call animal control or a humane society to help get rid of them. I have strays all over the place. I think their owners moved away and just left them behind because some of them have collars. They have destroyed the natural presence of squirrels, rabbits, chipmunks and the many birds that once populated my illustrious backyard. I am a cat fan so I can't say I'm too bothered. I have heard the spray repellant does work, though. Here's a few of them lounging on my patio furniture.
