When food was scarce, they were able to pack up and leave to find more food. Many of the early tribes around the world followed their food as it moved.
The indigenous people of Australia had a nomadic lifestyle because they moved around with the seasons and the availability of food in any given area. They never hunted or gathered any food until...
The only available food source on the Great Plains was the large, roaming herds of elk, deer and buffalo (bison). It was around a million square miles of nothing much more than grass, which supported...