Sustainable hunters

The image of the Native Americans as guardians of the environment, people who lived in harmony with nature, is widespread.  Is it true though? 

The way that bison were hunted might be considered useful evidence.  Entire herds would be stampeded and guided towards high cliff edges, called buffalo jumps, sending hundreds of animals to their death. 

The hunters simply had to go and harvest as much of the meat as they could eat before it went off, leaving the rest to be consumed by scavengers.  The picture is of the surprisingly named "Head Smashed-In buffalo jump"

Harmony indeed.