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Muskellunge: Esox masquinongy
http://www.michigan.gov/dnr/0,1607,7-153-10364_18958-45684--,00.html
Fact sheet with image.
Northern Pike: Esox lucius
http://www.michigan.gov/dnr/0,1607,7-153-10364_18958-45685--,00.html
Fact sheet, focusing on the appearance on biology of this fish as it occurs in the U.S. Great Lakes. Includes an image.