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In page Tiliqua rugosa:

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It has a triangular head and a bright blue tongue.[1] Its short, stumpy tail is similar in shape to its head. This possibly evolved as a defence mechanism against predators, and has led to the common name of "two-headed skink".[1] Its short tail also contains fat reserves, which the lizard lives upon during brumation in winter.[1] Unlike many skinks, shinglebacks do not exhibit autotomy and cannot shed their tails.[3]