We have two feral cats here that I have trapped, spayed/neutered and released. They keep the moles/voles/mice population down. We give them warm places to be in the winter, haybales etc and we feed them year round. They've been around for 5 or 6 years now, which is amazing in this climate. They also know when it it Thanksgiving, I swear they smell the turkey cooking from wherever they are, and coming and park on the deck until I come through for them (with a big plate). We named them (Mrs. Whitepaws and Chester)
After I trapped and spayed the Mrs. Whitepaws, they warned me we may never see her again. Well, after keeping her caged in my garage healing for 4 days. I let her go that morning and she was back for lunch.
They work hard. We love them.=^..^=