I agree with Dr David. Cassowary. Not Human. See carved cassowary shaman dagger in the first picture (Ex Erik Farrow)
Compare with the
Kangling/Kung ling Tibetan "spirit trumpet" made from a human femur. Used in the Chod ritual 'Cutting off of Ego', and various dubthab rites.
http://www.art-pacific.com/artifacts...s/bneknife.htm