Feral cats can usally hold there own. We have done the Re-release at our barn and it works well as long as you have them Fixed by a program that does it free.. and you give them a "known" escape route. We tried locking them in the office .. stink.. stall was takin for a boarder. Finally we made a small escape door for them into a shed. So far so good.. they are taming out a little you can pet most of them.. Might be all the treats the Barn Moms, are bringing from home