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Terrapene carolina triungis | ©Dietrich Meyer (Bryan, Texas, US) Terrapene carolina (Emydidae) is a species of box turtle found throughout the eastern United States and Mexico. It has six recognized subspecies, four of them are found in the United States, and two subspecies are found in Mexico. All box turtles have a bilobed, hinged plastron that allows the turtle to close its shell almost completely (that is why they are named box turtles). When frightened...