It still leaves holes in the rules, because the bat's Blindsight is listed as (Ex), even though that's how they friggen see. Same with the snake's constriction - does that count as his natural weaponry? If not, why not? Its not like the snake has to learn to constrict, its how his body was made! And its not a magical or pseudo-magical ability like Troll Regeneration. I really think they should have made this explicit.