In cartoons, when a turtle is spooked, it retreats into and closes up its shell. While used for comic effect, this imagery is based in fact — although not all turtles are capable of this protective ...

Identification of turtles -- Key to the turtles of the United States and Canada -- Chelydridae: snapping turtles -- Chelydra serpentina, snapping turtle -- Macroclemys temminckii, alligator snapping ...

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