Persistence hunting
A group of about four men start out on a search. Finding a suitable antelope, they move towards it, and the animal runs away. They check the signs, such as broken blades of grass, and follow it more slowly, but persistently. Eventually the animal has to stop to eat grass. Grass has so little nutrient that continual eating during the day is essential for their survival. If the antelope runs off into the far distance, one of the younger men is chosen to run after it while the others jog along behind. The runner comes back to say where the animal has gone. In this way younger members with endurance and older men with experience have their roles in the hunt. Eventually the men catch up while the animal can run no further without digesting grass (which is its 'fuel').