Though wooly mammoths are thought to have completely died by the end of the Pleistocene epoch, there were still some of them that managed to survive on the far and isolated island of Wrangel. They lived there until about 4000 years ago which is several centuries after the Pyramid of Giza had been built. Scientists believe that this small island drifted apart from the mainland carrying a small group of these giants on it, having saved their population for quite a long period of time.