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Because they move without limbs, snakes need robust skin that can withstand constant friction. Some species climb up rough tree trunks, while others burrow into abrasive sand. What makes the skin of a snake so durable?
Consider: The skin of snakes can differ in thickness and structure from one species to another. However, the skin of all snakes has one thing in common: It is firm on the outside and becomes progressively softer toward the inside.
