Rodents
Rodentia
Identifications
American beaver
Castor canadensis
Caption
Basioccipital
Contributors
Mammal Division 
(copyright holder), Museum of Zoology, University of Michigan
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It is a partnership of the University of Michigan School of Education, University of Michigan Museum of Zoology, and the Detroit Public Schools. This material is based upon work supported by the National Science Foundation under Grant DRL-0628151.
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