Our forefathers were intelligent enough to invent tools. They were capable of art and war. They formed societies and developed a distinctive culture in each. They were certainly clever enough to recognise a basic fact of ecology — that not all parts of the environment were equally hostile nor equally advantageous. Certain places, particularly those that were near water bodies, are especially propitious. Here, in such places, they had easy access to plant food and water. Small animals that came to drink and feed there were easy prey. The humans had only to protect themselves from attack from predatory animals or other human tribes and their future would be ensured. Here, in such places, they did not have to find sustenance, the environment supported them. Such places were paradise.