Conversation so far:
what was the importance and uses of bison for the blackfoot confederacy?
The Niitsitapi considered the animal sacred and integral to their lives.
how did they use bison?
The Niitsitapi main source of food on the plains was the American bison.
if it was sacred, why did they eat it?
CANNOTANSWER.

Question: how else did they use bison?
Self-contained rewrite: how else did the Blackfoot Confederacy use bison, aside from food?