What's the best way to attach lower jaw to upper on a warthog skull? Got mine de-greased and ready to bleach, then next step is to get the 2 pieces together. Bob

A good clear epoxy! A dab at the jaw pivots and a line between the top and bottom teeth.
Make sure you rub the areas down well with a solvent, like MEK before applying the epoxy.

I drilled 2 small holes through the lower jaw and ran wire through the skull. That way I can easly hang it on the wall.