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While the adult size of these animals will vary based on species and sex, most adult blue tongue skins are between 14 and 18 inches in total length. These skinks are extremely hardy and do very well in the terrarium. Captive life spans in excess of 20 years are often reported.
Blue Tongue Lizard Blue-tongue Skink. Blue tongue lizards come in a variety of sizes and colours but they all have distinctive blue tongues. Their blue tongue is a defensive mechanism. When the lizard is threatened it sticks out its large blue tongue and hisses loudly to scare off predators.