I have a camera in my nest box and it would appear two of the three nestlings don’t have any eyes. They are now 13 days old and their heads look different from the one that does have eyes. They behave normally, but what happens when it comes time to fledge. Will the parents stop feeding them to starve to death? Do I just let them die? I know a blind BB can’t survive on their own. Has anyone had this happen before? What do I do?