The Native Americans such as the Blackfoot:
Method of the hunt---- Hunters herded the bison and drove them over the cliff, breaking their legs and rendering them immobile. Tribe members waiting below closed in with spears and bows to finish the kills. The Blackfoot people called the buffalo jumps "pishkun", which loosely translates as "deep blood kettle".
As many have pointed out, the majority of the bison were left to die slowly and ignored as the hunters took all the meat they needed to carry and left off.