AdvertisementFungus Provides Clues To North American ExtinctionsNovember 20, 2009Richard HarrisfacebookEmailNorth America was once home to mammoths, mastodons (above) and beavers the size of black bears. (University of Wisconsin-Madison)
North America was once home to mammoths, mastodons (above) and beavers the size of black bears. (University of Wisconsin-Madison)