:::::::::Defensive walls. When people lived in caves, they erected temporary walls to defend the entrance from predators and the elements. --[[User:JefferyA|JefferyA]] 22:14, 7 September 2011 (EDT) | :::::::::Defensive walls. When people lived in caves, they erected temporary walls to defend the entrance from predators and the elements. --[[User:JefferyA|JefferyA]] 22:14, 7 September 2011 (EDT) |