The box turtle (a North American land turtle) was so named because it has a hinged bottom shell that allows the shell to be closed into a tight box. If something frightens the turtle, it pulls its head, legs and tail into the shell and clamps the hinge shut.
This way, very few enemies can get at it. Box turtles are fond of wild strawberries. Sometimes they eat so much that they can’t fit all the way back into their shells to avoid enemies. Box turtles also stuff themselves with mushrooms, insects, earthworms, and almost any other food they can find.–Dick Rogers