When I was a kid, we hosted a steady stream of orphaned or lost young wildlife. Some of them made it, and some of them didn't. The most interesting were a pair of young squirrels my brother and I found on the ground under a tree. We raised them to adulthood and kept them as long as my mother could stand it. Then, we released them into the wild with no apparent ill effects, except occasionally they'd sit in the trees outside our windows and gaze wistfully into their old home.