Somewhere around 5,000B.C., prehistoric hunters settled in the fertile valley between the Tigris and Euphrates Rivers. These people changed from food gatherers to food producers; instead of having to hunt for their food, they raised their own animals. Instead of using caves for shelter, these people made more permanent residences of mud, bricks, or reeds; and as settlements became permanent, they also became more populated. Villages became towns which then took over other neighboring villages and became cities that eventually formed into kingdoms. Welcome to Ancient Egypt.