Why this Australian lizard flashes a bright blue tongue at its enemies

Nature · Published 3 October 2026 Swipe more like this →

In short: The blue-tongued skink is a master of the bluff. When threatened, this shy, ground-dwelling lizard puffs up its body and thrusts out a startlingly bright tongue to intimidate rivals. Beyond this dramatic display, it possesses a surprising reproductive strategy that bridges the gap between egg-laying and live birth.

Native to Australia and parts of Indonesia, the blue-tongued skink belongs to the genus Tiliqua. These lizards are known for their broad, flat bodies and short limbs, which help them navigate diverse environments ranging from forests and grasslands to suburban backyards. While generally docile, they are formidable when cornered, capable of delivering a powerful bite or hissing loudly to deter predators. If grabbed by the tail, they can even shed the appendage to escape, though it eventually regenerates.

The skink’s reproductive biology is particularly fascinating. Unlike many reptiles that lay shelled eggs, blue-tongued skinks are live-bearing. They carry membrane-enclosed egg sacs internally, which lack shells and rupture as they are expelled during birth. This process is supported by an elaborate, placenta-like structure that facilitates oxygen exchange for the developing embryos. Females typically produce litters of six to 12 young, though they can occasionally give birth to as many as 25.

These lizards are opportunistic omnivores, feeding on everything from insects and snails to flowers and berries. They store fat in their tails to survive periods of drought, a vital adaptation for life in the Australian interior. Newborns are remarkably self-sufficient, reaching adult size in less than a year if food is abundant. In human care, these resilient creatures can live for 15 years or more, often displaying a calm temperament that has earned them the nickname 'the dogs of reptiles' among enthusiasts.

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