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Two kinds of snapping turtles occur in North America, and both of them can be found in Illinois. Alligator snappers, which most people will never see, are listed as endangered, and they inhabit only larger rivers and streams in the southern part of the state, the Mississippi, Ohio and Wabash Rivers, and tributaries directly connected to them. In fact, no wild alligator snapping turtle was documented in Illinois for the thirty years between 1984 and 2014, when scientists from the Illinois Natural History Survey discovered one.
(Ironically, as I reported in a commentary last year, they discovered a wild alligator snapper as they sought to relocate individuals they had translocated from other states as part of a multi-year program to reestablish alligator snapping turtles in Illinois. More on that project here in future.)