The bear-sized giant beaver was the largest rodent of all time! Researchers believe that it likely became extinct because it simply ran out of things to eat. Unlike modern beavers that cut down trees for food, giant beavers fed on tender aquatic plants that disappeared as the climate changed. Want to see even more giant prehistoric mammals in-person? Come visit Mysteries of the Ice Ages! #IceAges #NHMU #GiantBeaver #BeaverFacts #UtahMammoth | Natural History Museum of Utah