Robert Valentic / Centralian blue-tongued skink {Tiliqua multifasciata} basking next to hummock grass shelter site, Nanutarra Roadhouse, Western Australia

Robert Valentic / Wesern blue-tongued skink {Tiliqua occipitalis} Nullarbor Plain, Caiguna, Western Australia

Miles Barton / Pygmy blue tongued skink (Tiliqua adelaidensis) feeding on mealworm on fishing line, a technique used by scientists and conservationists to catch them, and being filmed with straightscope lens. Burra,...

Miles Barton / Pygmy blue tongued skink (Tiliqua adelaidensis) feeding on mealworm on fishing line, a technique uded by scientists and conservationists to catch them. Burra, South Australia

Miles Barton / Pygmy blue-tongued skink (Tiliqua adelaidensis) on sand, Australia. It was thought for a time to be extinct, and is still threatened

Robert Valentic / Juvenile Northern Blue tongued skink {Tiliqua scincoides intermedia} Mt Isa, Queensland, Australia

Steven David Miller / Blue tongued skink {Tiliqua scincoides} resting in leaf litter, Garig Gunak Barlu National Park, Cobourg Peninsula, Northern Territory, Australia

Steven David Miller / Blue tongued skink {Tiliqua scincoides} resting on log, Garig Gunak Barlu National Park, Cobourg Peninsula, Northern Territory, Australia

Steven David Miller / Blue tongued skink {Tiliqua scincoides} with tongue extended in threat display, Garig Gunak Barlu National Park, Cobourg Peninsula, Northern Territory, Australia

Barry Bland / Blue tongued lizard / skink {Tiliqua scincoides}

Barry Bland / Blue tongued lizard / skink {Tiliqua scincoides}

Steven David Miller / Blue tongued skink {Tiliqua scincoides} resting on log, Garig Gunak Barlu National Park, Cobourg Peninsula, Northern Territory, Australia