What I didn't include was links on the use of ivory from endangered species, which is prohibited. There are also laws against trading in arts and crafts made from ivory, claiming to be made by Native American/Alaskan/Inuits that aren't, which I didn't include links to either. By definition, fossilized ivory can't be harvested from endangered species (I know that seems self-evident, but apparently it isn't to everyone), so I didn't include information on the above because it was irrelevant to the discussion here.