The Missing Universe - and How to Find It

This milk tooth from a Wooley Mammoth (Mammuthus primigenius) was found in Wookey Hole, Somerset. The mamoth, like its close relatives the extant elephants, had four molars. As the front pair wore down and droped out in pieces, the back pair shifted forward, with two new molars emerging in the back of the mouth. Elephants replace their teeth six times.