Giant beavers (members of the genus Castoroides) inhabited North America throughout the mid- to late Pleistocene. They went extinct along with dozens of other megafaunal species at the end of the last Ice Age, approximately 10,000 years ago. Now a team of researchers in Canada has uncovered a possible reason of their extinction: vanishing food source. More importantly, the scientists have discovered that these enormous rodents did not eat wood —...