I came across this today quite by accident, but thought it was 
appropriate given the talk about man being a scavenger and not relying 
heavily on meat. Persistence hunting is thought to be the most ancient 
form of hunting - literally seperating an animal from the herd and 
pursuing it til it falls from exhaustion. You would not even require a 
spear to do this - a simple cutting tool to finish the animal off would 
suffice. Anyway, very cool stuff! Certainly food for thought - any 
primitive man, as long as he could sweat and carry water (or find water 
along the way, I supose?), could accomplish this.

http://www.youtube.com/watch?gl=FR&hl=fr&v=9wI-9RJi0Qo