Skulls and Bone Meal

[RawZi]

If someone foraged some bones (animal skulls), how would they go about using them nutritionally (raw)?  Would one soak them in Bragg's apple cider vinegar or lemon?

[van]

I have filed ( a couple of tablespoons powder) leg bones for years.  So far the best file I can find is a flat ferrier's file that is used to trim hoofs.  I eat or make it twice a day.  For I think that way back when they ate animals small enough to eat the bones, like birds, rabbits, mice etc.  Even house cats will eat the entire mouse, save the head and assorted small organs at times.  Botton line, entire animal with all it's store house of nutrients packed away in different body parts.