One of the attractive displays at the extensive site of Twyfelfontein's 5,000 rock engravings or petroglyphs, ranging from simple geometric designs to complex friezes of animals.Twyfelfontein, or 'Doubtful Spring', has a small perennial spring, which from time immemorial would have attracted a large number of wild animals and created an ideal environment for San hunters who left their mark in this sprawling rock-strewn site about seven thousand years ago. Purros