The remarkable stories of children brought up by animals, including a young Ukrainian woman who, between the ages of three and eight, lived as part of a pack of wild dogs. Such cases are so rare that very little is known about the mental state of the children and attempts to rehabilitate them are almost always unsuccessful. New evidence suggests that this experience may alter the way their brains function for the rest of their lives -- scientists believe the human mind has to develop language within a certain period or this chance is gone forever.