by Akash
Gopher snake (Pituophis catenifer) - The largest Illinois snake, with a record length of 7 feet, 2 inches.
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Black rat snake (Elaphe obsoleta) - Can grow up to 6 feet long.
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Eastern milksnake (Lampropeltis triangulum) - Can grow up to 5 feet long.
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Northern red-bellied snake (Storeria occipitomaculata) - Can grow up to 3 feet long.
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Smooth green snake (Opheodrys vernalis) - Can grow up to 2 feet long.
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Brown snake (Storeria dekayi) - Can grow up to 2 feet long.
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Eastern ribbon snake (Thamnophis sauritus) - Can grow up to 3 feet long.
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