Woodchuck, groundhog, whistlepig
Marmota monax
Identifications
mountain beaver
Aplodontia rufa
Gambian rat
Cricetomys gambianus
North American porcupine
Erethizon dorsatum
woodchuck, groundhog, whistlepig
Marmota monax
Location
University of Michigan Museum of Zoology
Caption
rodent jaw structure
Contributors
Phil Myers (photographer, copyright holder), Museum of Zoology, University of Michigan
Animal Diversity Web Staff 
(photographer)
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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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