Here are a series of videos aired on the Discovery Channel following a man as he makes contact with a remote (but present day) society of potentially canibalistic humans.  As you watch, ask yourself how have the humans adapted to their surroundings and how have they adapted their surroundings to themselves.

 

Part I 

 

Part II

 

 

Part III

 

 

Part IV

 

 

Part V

 

 

Part VI