My little girl found a baby bird in our backyard 2 weeks ago. I don't know what kind he is (sort of looks like a sparrow to me, I'll post pictures tomorrow), and initially I did not think he'd make it, since he was barely feathered, but we've been feeding him baby bird formula and caring for him for 2 weeks, and he's thriving and doing great. We tried real hard to find his parents (hung him in a basket in a tree, hoping for his parents to locate him, which did not happen), and we tried not to handle him much, but he has become very tame, and follows us if we try to leave. He shows no interest in live insects or seeds we put into his cage, and I'm wondering how we can re-introduce him to the wild, and get him to eat on his own. He is now fully feathered, and can fly fairly well, but still just sits there and then "opens wide" when we come with food. I've tried to let him fly in my fully enclosed chicken run, but he always comes back to me. What to do?