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In many cases the cast skin peels backward over the body from head to tail, in one piece like an old sock. A new, larger, and brighter layer of skin has formed underneath. [ 5 ] [ 7 ] An older snake may shed its skin only once or twice a year, but a younger snake that is still growing may shed up to four times a year.
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Reptiles evolved from amphibious ancestors which left the water and became terrestrial. To prevent loss of moisture, reptilian skin lost the softness and moisture of amphibian skin and developed a thick stratum corneum with multiple layers of lipids, which served as an impermeable barrier, as well as providing protection from ultraviolet light. [5]
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B. biporus is pink and worm-like, 18–24 cm (7.1–9.4 in) in snout-to-vent length (SVL) and 6–7 mm (0.24–0.28 in) in width. It lives for one to two years. Its skin is closely segmented to give a corrugated appearance, and like earthworms, its underground movement is by peristalsis of the segments.
The species normally shed their skin as a whole, including the eye covering. This takes up to several hours, during which the lizard rubs against objects to help the process. The species exhibits sexual dimorphism , with males being stockier than females and having a larger head although females generally grow larger than males.
In the skin of some reptiles, scales lay over the top of the protective osteoderm layer. The ratio of scale size to osteoderm size and their organization vary by species. [ 7 ] The majority of species have a one to one ratio of scales to osteoderms, with little correlation between the layout. [ 3 ]