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Michigan's only venomous snake, Sistrurus catenatus, has been recorded widely in Region I except for most of the Midland-Saginaw Bay-Thumb area, where it has only been recorded from Huron County.
piscivorus Lacepede, cottonmouth S Crotalus horridus Linnaeus, timber S rattlesnake Sistrurus catenatus (Rafinesque), N eastern massasauga Hypothetical: Eumeces anthracinus (Baird), coal skink Regina grahami Baird & Girard, Graham's water snake Tropidoclonian lineatum (Hallowell), lined snake Extirpated: Farancia abacura (Holbrook), mud snake X CLASS MAMMALIA Order Didelphimorphia (American opossums) Family Didelphidae (opossums) Didelphis virginiana Kerr, opossum I Order Insectivora (shrews and moles) Family Soricidae (shrews) Blarina brevicauda (Say), short-tailed I shrew Cryptotis parva (Say), least shrew I Sorex cinereus Kerr, masked shrew N S.