National Aquarium - Diamondback Terrapin
https://aqua.org/explore/animals/diamondback-terrapin
WebOverview. Diamondback terrapins are aquatic turtles with concentric, diamond-shaped markings and grooves on the scutes (plates) of their carapaces (top shells), which range from medium gray or brown to nearly black. Their skin can be pale gray to black, marked with dark spots, blotches or stripes.
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