Ring-necked snake (Diadophis punctatus), Tallgrass Prairie National Preserve, 2011.
This harmless colubrid is found throughout most of the United States, central Mexico and southeastern Canada. These secretive, nocturnal snakes are rarely seen during the day. It is best known for its defensive behavior of curling up and exposing a bright red-orange posterior and ventral surface when threatened.
U.S. National Park Service
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