There are actually two different kinds of mummies. The artificial mummies, which is what the ancient egyptians did. The process was done by removing the organs from the body, then wrapping it in a linen cloth. The body was then treated with preservatives which dried the body out. The second kind is the naturally made mummies. Which means something in nature occurs and dries or freezes a being which preserves them, in turn making them a form of a mummy.