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How do ridged shells help bottom-walking turtles such as snapping turtles?

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Illustrations of ten representative chelonians, including spiny softshell turtle, Galapagos giant tortoise, green turtle, alligator snapping turtle, Blanding's turtle, common map turtle, eastern box turtle, eastern painted turtle, spotted turtle, and eastern mud turtle, each labeled with its common and scientific name. A scale bar at the bottom shows size comparison. — turtle Turtles (order Testudines).

For bottom-walking turtles such as snapping turtles, the ridged carapaces on their shells may assist in camouflage. By breaking up the turtle's outline, these ridges help the animal blend into its environment, which is a form of concealing coloration.1