If Sligs did evolve from slug-like creatures it would stand to reason that they dont have bones because slugs dont have bones...
I agree with TheKhanzumer - They probbly have some kind of starge tissue insted... Maybe they could have speical cells that have cell walls (like plants, and inparticular wood) which would make them hard (Animal cells have only a membrane so they are soft). This would probbly be even better then bone since it could grow and heal faster then bone ever would and since some woods are harder then steel it could be stronger then bone as well... But thats only a theory...
... For all we know sligs may have no bones or anything naturly and the Vykkers insert metal joints ect. when the Slig is still young (Like a great big artifisal hip transplant).
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