I have, in the past, just left them out and let nature take its course. But then I got to thinking - why do I want to feed the local predators after I've invested my time, effort and money into these birds? So I decided to recoup some of that by butchering and pressure canning them. The canning process tenderizes them nicely, and they are great served over rice, in soup, stew, or any other chicken recipes you can think of. I have a friend who deals with her old hens in a different way. (She just doesn't have the heart to butcher her laying hens herself) She gives them to me or other friends knowing full well that they're going to get butchered anyway. She gets her chickens for meat from other friends who give her their spent hens. It works well for everyone concerned.