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Plastron of box turtle. Notice the hinge which has allowed the turtle to tightly close its “door.” And, the center is concave, indicating a male is hiding inside. (Ineta McParland / Flickr; cc by 2.0)

TURTLE ANATOMY art: Titimaster / Wiki (CC Lic.) Key: 1. Eye 2. Nuchal scute 3. Central/vertebral scute 4. Costal scute…

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