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Named By: John Wells Foster in 1838
Time Period: Late Pliocene - Late Pleistocene, 3-0.011 Ma
Location: Canada - Ontario, Yukon. USA - Alabama, Florida, Georgia, Illinois, Iowa, Kansas, Michigan, Nebraska, New Jersey, Ohio, Oklahoma, Pennsylvania, South Carolina, Tennessee, Virginia
Size: Largest individuals up to 2.2 meters long, not including the tail
Diet: Herbivore
Fossil(s): Multiple individuals
Classification: | Chordata | Mammalia | Rodentia | Castoridae | Castoroidinae | Castoroidini |
Also known as: | Castoroides nebrascensis | Burosor efforsorius |

Castoroides, or giant beaver, is an extinct genus of enormous beavers that lived in North America during the Pleistocene. C. leiseyorum and its northern sister species Castoroides ohioensis, were the largest beavers to ever exist.

Read more about Castoroides at Wikipedia
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