Other animals have been part of our world since long before our lineage became human. We initially feared carnivores, but later boldly collected bones from the remains of their prey. Over time we developed the capacity to kill big herbivores ourselves, ultimately even those as large as elephants. Our ancestors depicted these animals on the walls of the caves and rock shelters that they occupied, both in Africa and in Europe, and wove them into folklore and ritual. Today, many people spend large sums of money to travel to places where they can still view big wild animals living under fairly natural conditions. Some of those who have become super-rich invest their wealth in buying wildlife preserves where they can retire far from city life.